White Dwarfs In Open Clusters

Download White Dwarfs In Open Clusters full books in PDF, epub, and Kindle. Read online White Dwarfs In Open Clusters ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!

White Dwarfs and the Ages of Open Clusters

Author : Elizabeth Jane Jeffery
Publisher :
ISBN 13 :
Total Pages : 504 pages
Book Rating : 4.:/5 (78 download)

DOWNLOAD NOW!

Book Synopsis White Dwarfs and the Ages of Open Clusters by : Elizabeth Jane Jeffery

Download or read book White Dwarfs and the Ages of Open Clusters written by Elizabeth Jane Jeffery and published by . This book was released on 2009 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: Open clusters have long been objects of interest in astronomy. As a good approximation of essentially pure stellar populations, they have proved very useful for studies in a wide range of astrophysically interesting questions, including stellar evolution and atmosphere, the chemical and dynamical evolution of our Galaxy, and the structure of our Galaxy. Of fundamental importance to our understanding of open clusters, as well as many other questions in astrophysics, is the accurate determination of ages. Currently there are two main techniques for independently determining the ages of stellar populations: main sequence evolution theory (via cluster isochrones) and white dwarf cooling theory. Open clusters provide the ideal environment for the calibration of these two important clocks, as well as the unique opportunity to directly compare and refine our understanding of both theories. Here I present a photometric study of six open clusters, including both ground-based data, and new, deep photometric data from the Hubble Space Telescope. From the former I derive main sequence turn off ages, while the latter will be used to search for faint cluster white dwarfs. From these data I measure a white dwarf age for each cluster and directly compare these ages with those I find from the main sequence turn off age. For this analysis I employ a new Bayesian statistical technique that has been developed by our group. Additionally, I use this new technique to explore the feasibility of a new method to determine cluster white dwarf ages from the hot (bright) white dwarfs alone, and its first successful application to the Hyades.

White Dwarfs in Open Clusters

Author : Kurtis A. Williams
Publisher :
ISBN 13 :
Total Pages : 380 pages
Book Rating : 4.:/5 (321 download)

DOWNLOAD NOW!

Book Synopsis White Dwarfs in Open Clusters by : Kurtis A. Williams

Download or read book White Dwarfs in Open Clusters written by Kurtis A. Williams and published by . This book was released on 2002 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:

A Photometric Search for White Dwarfs in Intermediate-age Open Clusters

Author : Barbara Jean Anthony Twarog
Publisher :
ISBN 13 :
Total Pages : 276 pages
Book Rating : 4.X/5 (1 download)

DOWNLOAD NOW!

Book Synopsis A Photometric Search for White Dwarfs in Intermediate-age Open Clusters by : Barbara Jean Anthony Twarog

Download or read book A Photometric Search for White Dwarfs in Intermediate-age Open Clusters written by Barbara Jean Anthony Twarog and published by . This book was released on 1983 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

White Dwarfs in the Old Open Cluster M67

Author : Thomas James Ahrens
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (464 download)

DOWNLOAD NOW!

Book Synopsis White Dwarfs in the Old Open Cluster M67 by : Thomas James Ahrens

Download or read book White Dwarfs in the Old Open Cluster M67 written by Thomas James Ahrens and published by . This book was released on 1999 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

White Dwarfs: Cosmological and Galactic Probes

Author : E. Sion
Publisher : Springer Science & Business Media
ISBN 13 : 9781402036934
Total Pages : 288 pages
Book Rating : 4.0/5 (369 download)

DOWNLOAD NOW!

Book Synopsis White Dwarfs: Cosmological and Galactic Probes by : E. Sion

Download or read book White Dwarfs: Cosmological and Galactic Probes written by E. Sion and published by Springer Science & Business Media. This book was released on 2005-08-25 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: The emphasis on white dwarf stars and cosmology arises from the most recent advances in cosmological and galactic structure research in which white dwarf stars are playing a very prominent role. Examples are Type Ia supernovae (i.e. white dwarf supernovae), the origin and evolution of the universe, the age of the galactic disk, cosmochronology using white dwarfs in globular clusters and galactic clusters, and the physics of accretion onto compact (very dense) stars. As an assisting guide to the reader, we have included, by invitation, comprehensive review articles in each of the four major areas of the book, white dwarf supernovae, cosmology, accretion physics and galactic structure. The reviews include introductory material that they build upon. The book is suitable and most useful to advanced undergraduates, graduate students and scientific professionals (e.g. astronomers, astrophysicists, cosmologists, physicists).

Planetary Nebulae (IAU S323)

Author : Xiaowei Liu
Publisher : Cambridge University Press
ISBN 13 : 9781107169913
Total Pages : 0 pages
Book Rating : 4.1/5 (699 download)

DOWNLOAD NOW!

Book Synopsis Planetary Nebulae (IAU S323) by : Xiaowei Liu

Download or read book Planetary Nebulae (IAU S323) written by Xiaowei Liu and published by Cambridge University Press. This book was released on 2017-09-28 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Planetary nebulae, glowing shells of ionized gas, are the spectacular products of the evolution of low- and intermediate-mass stars. For astrophysicists, they are important laboratories for the understanding of atomic, molecular, dust, and plasma processes in different cosmic environments; they enable the exploration of the fundamental physics of single and binary star evolution including nucleosynthesis, rotation, mass transfer and loss, and magnetic fields; and they help trace stellar populations, the kinematics, and chemistry of galaxies including our own galaxy, the Milky Way. This volume reviews the current status of this vibrant research field in the form of invited reviews, contributed talks, and posters presented at the IAU Symposium 323. It should be of interest to researchers and advanced students interested in this field and in related fields, including stellar physics, the interstellar medium, and Galactic and extragalactic astronomy.

The Complex Lives of Star Clusters

Author : David Stevenson
Publisher : Springer
ISBN 13 : 3319142348
Total Pages : 351 pages
Book Rating : 4.3/5 (191 download)

DOWNLOAD NOW!

Book Synopsis The Complex Lives of Star Clusters by : David Stevenson

Download or read book The Complex Lives of Star Clusters written by David Stevenson and published by Springer. This book was released on 2015-05-09 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: As with the author’s recent books Extreme Explosions and Under a Crimson Sun, the complex topic of star clusters is broken down and made accessible with clear links to other areas of astronomy in a language which the non-specialist can easily read and enjoy. The full range of topics are addressed regarding how star clusters are formed. Why is it some are dense conglomerates of stars while others are looser associations? Are the young, brilliant clusters seen in neighboring galaxies such as the Large Magellanic Cloud, M33 or M82 analogous to the ancient globulars seen in the Milky Way? How will these clusters change as their stars wane and die? More interestingly, how does living in a dense star cluster affect the fates of the stars and any attendant planets that accompany them? Star clusters form many of the most dazzling objects in the astronomers’ catalogs. Many amateur astronomers are interested in exploring how these objects are created and what it would be like to live among these objects. From the historical views of how star clusters came about to the most recent assumptions about how stars within these clusters evolve, different strands of science, from observation to theory, are woven together into a compelling investigation specifically targeted at amateur astronomers.

White Dwarfs

Author : Evry L. Schatzman
Publisher : Springer Science & Business Media
ISBN 13 :
Total Pages : 496 pages
Book Rating : 4.3/5 (91 download)

DOWNLOAD NOW!

Book Synopsis White Dwarfs by : Evry L. Schatzman

Download or read book White Dwarfs written by Evry L. Schatzman and published by Springer Science & Business Media. This book was released on 1991 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1-Pre-White Dwarf Evolution and White Dwarf Cooling.- New pre-white dwarf evolutionary tracks.- Influence of the phase diagram in the cooling of white dwarfs.- PG1159 stars and the PNN-white dwarf connection.- Analysis of the soft X-ray data from the central star of NGC 7293.- Planetary Nebulae Nuclei with white dwarf spectra.- Atmospheric parameters of subluminous B stars.- White dwarf space densities and birth rates reconsidered.- A spectroscopic determination of the mass distribution of DA white dwarfs.- The age and formation of the Galaxy: clues from the white dwarf luminosity function.- Early results from the ROSAT Wide Field Camera.- The stellar component of the Hamburg Schmidt Survey.- White dwarfs in the Hamburg Schmidt Survey.- 2-Asteroseismology of White Dwarfs.- Asteroseismology of white dwarf stars with the Whole Earth Telescope.- A measurement of the evolutionary timescale of the cool white dwarf G117-B15A with WET.- On the interpretation of the dP/dt measurement in G117-B15A.- The boundaries of the ZZ Ceti instability strip.- Long term variations in ZZ Cetis: G191-16 and HL Tau 76.- Predicting the white dwarf light curves.- A wavelet analysis of the ZZ Ceti star G191 16.- An adiabatic survey for ZZ Ceti stars based on a finite element code.- A study of period change rates in post-AGB stars I. PG 1159-035.- Nonadiabatic nonradial pulsations for DAV white dwarf stars.- 3-Atmospheres and Envelopes.- NLTE Analysis of four PG1159 stars.- A search for trace amounts of hydrogen in DB stars.- Abundances of trace heavy elements in hot DA white dwarfs.- New results on radiative forces on iron in hot white dwarfs.- The effective temperature of the DBV's, and the sensitivity of DB model atmospheres to input physics.- The modified hydrostatic equilibrium equations for stratified high gravity stellar atmospheres.- The DBAQ G35-26.- LP 790-29: preliminary model atmospheres for this strongly polarized carbon white dwarf.- Some effect of the UV radiation from white dwarfs on the accretion of interstellar hydrogen.- Convection in white dwarfs: application of CM theory to helium envelope WDs.- Abundances in cool DZA and DAZ white dwarfs: new results using laboratory damping constants.- Evidence for fractionated accretion of metals on cool white dwarfs.- A new look at old friends: 40 Eri B and GD 323.- The Lyman Alpha line wing in hydrogen-rich white dwarf atmospheres.- Atmospheric parameters for DA white dwarfs in the vicinity of the ZZ Ceti instability strip.- Space Telescope observations of white dwarf stars.- 4-White Dwarfs in Binaries.- A deep spectroscopic survey of white dwarfs in common proper motion binaries.- Double degenerate common proper motion binaries.- Close binary white dwarfs.- New results on cataclysmic variable white dwarfs.- Whole Earth Telescope observations of the interacting white dwarf binary system AM CVn: first results.- IUE observations of V803 Cen in high and low states.- Whole Earth Telescope observations of PG1346+082.- On the origin of LMXRBS: the ONEMG case.

Planetary Nebulae in Open Clusters and the Mass Boundary Between the Progenitors of White Dwarfs and Neutron Stars

Author : Ahad O. Allakhverdiyev
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (233 download)

DOWNLOAD NOW!

Book Synopsis Planetary Nebulae in Open Clusters and the Mass Boundary Between the Progenitors of White Dwarfs and Neutron Stars by : Ahad O. Allakhverdiyev

Download or read book Planetary Nebulae in Open Clusters and the Mass Boundary Between the Progenitors of White Dwarfs and Neutron Stars written by Ahad O. Allakhverdiyev and published by . This book was released on 1998 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mass boundary between progenitors of white dwarfs and neutron stars is discussed.

Unlocking the Secrets of White Dwarf Stars

Author : Hugh M. Van Horn
Publisher : Springer
ISBN 13 : 331909369X
Total Pages : 335 pages
Book Rating : 4.3/5 (19 download)

DOWNLOAD NOW!

Book Synopsis Unlocking the Secrets of White Dwarf Stars by : Hugh M. Van Horn

Download or read book Unlocking the Secrets of White Dwarf Stars written by Hugh M. Van Horn and published by Springer. This book was released on 2014-11-14 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: White dwarfs, each containing about as much mass as our Sun but packed into a volume about the size of Earth, are the endpoints of evolution for most stars. Thousands of these faint objects have now been discovered, though only a century ago only three were known. They are among the most common stars in the Milky Way Galaxy, and they have become important tools in understanding the universe. Yet a century ago only three white dwarfs were known. The existence of these stars completely baffled the scientists of the day, and solving the mysteries of these strange objects required revolutionary advances in science and technology, including the development of quantum physics, the construction and utilization of large telescopes, the invention of the digital computer, and the ability to make astronomical observations from space. This book tells the story of the growth in our understanding of white dwarf stars, set within the context of the relevant scientific and technological advances. Part popular science, part historical narrative, this book is authored by one of the astrophysicists who participated directly in uncovering some of the secrets of white dwarf stars.

White Dwarfs

Author : J. Isern
Publisher : Springer Science & Business Media
ISBN 13 : 9401155429
Total Pages : 470 pages
Book Rating : 4.4/5 (11 download)

DOWNLOAD NOW!

Book Synopsis White Dwarfs by : J. Isern

Download or read book White Dwarfs written by J. Isern and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of white dwarfs has been steadily growing during the last years and now is a mature field extending its influence over many others. Since white dwarfs are long lived objects, they can be used to obtain information about the history of the Galaxy. The simplicity of their structures enables them to act as precise particle physics laboratories and the extreme con ditions reached at their surfaces allow us to test the equation of state and to study the behavior of matter under conditions impossible to be reached in terrestrial laboratories. Nevertheless, white dwarfs are still challenging astrophysicists. Many questions, ranging from the determination of funda mental parameters to the evolution of their outer layers, are still waiting for a satisfactory answer. The European Workshop series on White Dwarfs started in 1974 as a con sequence of the effort and enthusiasm of Professor Volker Weidemann. The existing proceedings of these meetings, together with those corresponding to the lAU Colloquia held in Rochester (1979) and in Hanover (1988), provide a unique opportunity to follow the development of this field. We hope that the present volume will provide a representative snapshot of the state of the art in 1996. In this sense we are very indebted to all the participants that have sent their contributions according to the instructions (this clearly excludes everybody beyond three sigmas from the standards).

White Dwarfs

Author : W.J. Luyten
Publisher : Springer Science & Business Media
ISBN 13 : 9401030812
Total Pages : 172 pages
Book Rating : 4.4/5 (1 download)

DOWNLOAD NOW!

Book Synopsis White Dwarfs by : W.J. Luyten

Download or read book White Dwarfs written by W.J. Luyten and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: When the Executive Committee of the International Astronomical Union asked me, in 1968, to organize a Symposium on White Dwarfs it became evident that members of at least four Commissions of the IAU should participate, and that the most oppor tune place, and time to hold such a Symposium would be somewhere in the British Isles and just preceding the Fourteenth General Assembly at Brighton in August, 1970. After a preliminary correspondence with Dr. D. W. N. Stibbs it was decided to accept his invitation to hold the Symposium at St. Andrews University, Scotland, while the dates 11-13 August 1970 were selected. I am sure I speak for all the partici pants of the Symposium when I express our deep gratitude to Dr. Stibbs for the admirable way in which he planned and organized this meeting down to the smallest details - the success of the conference is due in no small measure to his continuous and painstaking efforts. An organizing committee was formed, consisting of O. J. Eggen (Photometry), J. L. Greenstein (Spectroscopy), A. G. Masevitch (Stellar Interiors), V. Weidemann (Stellar Atmospheres), D. W. N. Stibbs (local chairman), with myself (Proper Motions and Parallaxes) as overall chairman.

Star Clusters (IAU S266)

Author : International Astronomical Union. Symposium
Publisher : Cambridge University Press
ISBN 13 : 9780521764995
Total Pages : 606 pages
Book Rating : 4.7/5 (649 download)

DOWNLOAD NOW!

Book Synopsis Star Clusters (IAU S266) by : International Astronomical Union. Symposium

Download or read book Star Clusters (IAU S266) written by International Astronomical Union. Symposium and published by Cambridge University Press. This book was released on 2010-02-04 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: Star clusters are important to many areas of astronomy, and as the basic building blocks of galaxies, they can be used as key diagnostic tools within a wide range of disciplines in astrophysics. Star cluster populations are powerful tracers of the formation, assembly and evolutionary history of their parent galaxies. Although their importance has been recognised for decades, only in recent years has this area seen a major investment in time and effort. IAU Symposium 266 consolidates the expertise of leading researchers from a variety of topical subfields in astrophysics, to provide a comprehensive presentation of cutting-edge developments in theory, observations and simulations of star clusters and star cluster systems across a range of sizes and epochs. This volume gives an account of this forefront research, answering fundamental questions that will improve our understanding of numerous related issues and show how this field will take its next major step forward.

White Dwarfs and the Ages of Stellar Populations

Author : Steven Andrew De Gennaro
Publisher :
ISBN 13 :
Total Pages : 270 pages
Book Rating : 4.:/5 (782 download)

DOWNLOAD NOW!

Book Synopsis White Dwarfs and the Ages of Stellar Populations by : Steven Andrew De Gennaro

Download or read book White Dwarfs and the Ages of Stellar Populations written by Steven Andrew De Gennaro and published by . This book was released on 2009 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our group has developed a Bayesian modeling technique to determine the ages of stellar populations (in particular, open and globular clusters) using white dwarf (WD) cooling physics. As the theory of WD cooling is both simpler than, and essentially independent of, main sequence evolutionary theory, white dwarfs provide an independent measure of the ages of Galactic populations. We have developed a Bayesian technique that objectively incorporates our prior knowledge of stellar evolution, star cluster properties, and data quality estimates to derive posterior probability distributions for a cluster's age, metallicity, distance, and line-of-sight absorption, as well as the individual stellar parameters of mass, mass ratio (for unresolved binaries) and cluster membership probability. The key advantage of our Bayesian method is that we can calculate probability distributions for cluster and stellar parameters with reference only to known, quantifiable, objective, and repeatable quantities. In doing so, we also have more sensitivity to subtle changes in cluster isochrones than traditional "chi-by-eye'" cluster fitting methods. As a critical test of our Bayesian modeling technique, we apply it to Hyades UBV photometry, with membership priors based on proper motions and radial velocities, where available. We use secular parallaxes derived from Hipparcos proper motions via the moving cluster method to put all members of the Hyades at a common distance. Under the assumption of a particular set of WD cooling and atmosphere models, we estimate the age of the Hyades based on cooling white dwarfs to be 610 ± 110 Myr, consistent with the best prior analysis of the cluster main-sequence turn-off age (Perryman, et al. 1998). Since the faintest white dwarfs have most likely evaporated from the Hyades, prior work provided only a lower limit to the cluster's white dwarf age. Our result demonstrates the power of the bright white dwarf technique for deriving ages (Jeffery, et al. 2007) and further demonstrates complete age consistency between white dwarf cooling and main-sequence turn-off ages for seven out of seven clusters analyzed to date, ranging from 150 Myr to 4 Gyr. We then turn our attention to the white dwarf luminosity function. We use Sloan Digital Sky Survey (SDSS) data to create a white dwarf luminosity function with nearly an order of magnitude (3,358) more spectroscopically confirmed white dwarfs than any previous work. We determine the completeness of the SDSS spectroscopic white dwarf sample by comparing a proper-motion selected sample of WDs from SDSS imaging data with a large catalog of spectroscopically determined WDs. We derive a selection probability as a function of a single color (g-i) and apparent magnitude (g) that covers the range -1.0

Ecology of Blue Straggler Stars

Author : Henri M. J. Boffin
Publisher : Springer
ISBN 13 : 3662444348
Total Pages : 364 pages
Book Rating : 4.6/5 (624 download)

DOWNLOAD NOW!

Book Synopsis Ecology of Blue Straggler Stars by : Henri M. J. Boffin

Download or read book Ecology of Blue Straggler Stars written by Henri M. J. Boffin and published by Springer. This book was released on 2014-12-03 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: The existence of blue straggler stars, which appear younger, hotter, and more massive than their siblings, is at odds with a simple picture of stellar evolution. Such stars should have exhausted their nuclear fuel and evolved long ago to become cooling white dwarfs. They are found to exist in globular clusters, open clusters, dwarf spheroidal galaxies of the Local Group, OB associations and as field stars. This book summarises the many advances in observational and theoretical work dedicated to blue straggler stars. Carefully edited extended contributions by well-known experts in the field cover all the relevant aspects of blue straggler stars research: Observations of blue straggler stars in their various environments; Binary stars and formation channels; Dynamics of globular clusters; Interpretation of observational data and comparison with models. The book also offers an introductory chapter on stellar evolution written by the editors of the book.

A Search for Helium-core White Dwarfs in the Globular Star Cluster NGC 6752

Author : Carlos A. Hernandez
Publisher :
ISBN 13 :
Total Pages : 224 pages
Book Rating : 4.:/5 (979 download)

DOWNLOAD NOW!

Book Synopsis A Search for Helium-core White Dwarfs in the Globular Star Cluster NGC 6752 by : Carlos A. Hernandez

Download or read book A Search for Helium-core White Dwarfs in the Globular Star Cluster NGC 6752 written by Carlos A. Hernandez and published by . This book was released on 2014 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

White Dwarfs: Advances in Observation and Theory

Author : M.A. Barstow
Publisher : Springer Science & Business Media
ISBN 13 : 940112020X
Total Pages : 555 pages
Book Rating : 4.4/5 (11 download)

DOWNLOAD NOW!

Book Synopsis White Dwarfs: Advances in Observation and Theory by : M.A. Barstow

Download or read book White Dwarfs: Advances in Observation and Theory written by M.A. Barstow and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 555 pages. Available in PDF, EPUB and Kindle. Book excerpt: The European Workshop on White Dwarfs was initiated by Prof. V. Weidemann, with the first meeting held in Kiel (FRG) in 1974. Since then a similar workshop has been held almost every two years: Frascati (1976), Tel Aviv (1978), Paris (1981), Kiel (1984), Frascati (1986) and Toulouse (1990). Two major IAU colloquia have also been devoted to the study of white dwarfs (No. 53, Rochester NY, 1979; No. 114, Hanover, NH, 1988). Our most recent meeting, the 8th Workshop, marks a number of important advances in both observational and theoretical studies of white dwarfs. This coincides with a significant expansion in the size of the community active in the field, as was clear from an increase in the number of participants between this workshop (77) and that in Toulouse (46), just two years ago. Key parts of any workshop are the discussion sessions following the pa pers. However, these are difficult to record and, very often, the 'live' flavour of the debates is lost. During this workshop we carried out an experiment, recording the discussion sessions on video tape and then transcribing these later for the proceedings. Although the recordings were made in non-studio conditions with regard to lighting and noise, only a very small part was unin telligible. All participants were given an opportunity to check their questions and answers for scientific accuracy and to correct any errors arising in the transcription process.