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Author : H. Hubenet
Publisher :
ISBN 13 :
Total Pages : 408 pages
Book Rating : 4.X/5 (1 download)
Download or read book Abundance Determinations in Stellar Spectra written by H. Hubenet and published by . This book was released on 1966 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : H. Hubenet
Publisher :
ISBN 13 :
Total Pages : 374 pages
Book Rating : 4.:/5 (61 download)
Download or read book Abundance determinations in stellar spectra written by H. Hubenet and published by . This book was released on 1966 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : H. Hubenet
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (61 download)
Download or read book Abundance Determinations in Stellar Spectra written by H. Hubenet and published by . This book was released on 1966 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : International Astronomical Union
Publisher :
ISBN 13 :
Total Pages : 374 pages
Book Rating : 4.:/5 (9 download)
Download or read book Abundance Determinations in Stellar Spectra written by International Astronomical Union and published by . This book was released on 1966 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : International Astronomical Union
Publisher :
ISBN 13 :
Total Pages : 374 pages
Book Rating : 4.:/5 (866 download)
Download or read book Symposium on Abundance Determinations in Stellar Spectra, Held in Utrecht, the Netherlands, 10-14 Aug. 1964 written by International Astronomical Union and published by . This book was released on 1966 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : H. Hubenet
Publisher :
ISBN 13 :
Total Pages : 374 pages
Book Rating : 4.:/5 (471 download)
Download or read book Abundance Determinations in Stellar Spectra written by H. Hubenet and published by . This book was released on 1966 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lawrence H. Aller
Publisher :
ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (97 download)
Download or read book Abundance Determination in Stellar Spectra written by Lawrence H. Aller and published by . This book was released on 1966 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : P. E. Nissen
Publisher :
ISBN 13 :
Total Pages : 76 pages
Book Rating : 4.3/5 (91 download)
Download or read book ESO Workshop on Methods of Abundance Determination for Stars written by P. E. Nissen and published by . This book was released on 1980 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jennifer S. Sobeck
Publisher :
ISBN 13 :
Total Pages : 328 pages
Book Rating : 4.:/5 (98 download)
Download or read book An Atomic Physics Viewpoint of Stellar Abundance Analysis written by Jennifer S. Sobeck and published by . This book was released on 2007 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Element abundance trends with overall metallicity contain vital clues to the formation and evolution of the Galaxy. Abundances may be used to elucidate nucleosynthesis mechanisms and to ascertain rates of Galactic enrichment. To obtain accurate abundances, several crucial inputs such as high-quality spectroscopic observations, rigorous calculations of line transfer, and precise atomic data (e.g. transition probabilities) are necessary. The current work endeavors to improve abundance values for key elements with a four-fold approach: accumulation of hundreds of high-resolution stellar spectra in order to commence a systematic and thorough Manganese abundance derivation in cluster and halo field stars; re-determination of the neutral chromium oscillator strengths and application of this data to stellar abundance analyses; modification of a radiative line transfer code in order to yield accurate abundances from evolved stars; and semi-empirical derivation of transition probabilities to allow for the utilization of spectral features in the red visible and infrared wavelength ranges for abundance determinations. The first comprehensive investigation of manganese in globular clusters is done in this work. A subsolar Mn abundance trend for both halo globular cluster and field stars is found. The analysis shows that for the metallicity range -0.7>(Fe/H)>-2.7 stars of 19 globular clusters have a a mean relative abundance of (Mn/Fe)= -0.37±0:01 ([sigma] = 0.10), a value in agreement with that of the field stars: (Mn/Fe)= -0.36± 0.01 ([sigma] = 0.08). Remarkably, the (Mn/Fe) ratio remains constant in both stellar populations over a 2 orders of magnitude span in metallicity. Next, the present study employed branching fraction measurements from Fourier transform spectra in conjunction with published radiative lifetimes to determine transition probabilities for 263 lines of neutral chromium. These laboratory values are used to derive a new photospheric abundance for the Sun: log [element of](Cr I)[sun symbol] = 5.64±0.01 ([sigma] = 0:07). In addition, oscillator strengths for singly-ionized chromium recently reported by the FERRUM Project are employed to determine: log [element of](Cr II)[sun symbol] = 5.77±0.03 ([sigma] = 0.13). No indications of departures from LTE are found in the neutral chromium abundances. The current work then takes advantage of the fact that transition metals exhibit relatively pure LS coupling and employs standard formulae to yield semi-empirical oscillator strengths. These data were then compared to experimental gf values in order to assess accuracy. Finally, this study undertakes a new abundance investigation of the RGB and RHB stars of the M15 globular cluster. A detailed examination of the both the metallicity and n capture elements is performed. This work appears to confirm that star-to-star abundance variations do occur among the M15 giants (which was initially observed by Sneden et al. 1997, 2000).
Author : International Astronomical Union. General Assembly
Publisher : Springer
ISBN 13 :
Total Pages : 124 pages
Book Rating : 4.:/5 (43 download)
Download or read book Accuracy of Element Abundances from Stellar Atmospheres written by International Astronomical Union. General Assembly and published by Springer. This book was released on 1990-03-21 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: To get a reasonably realistic picture of the structure and evolution of stars one needs to know accurately the abundances of chemical elements and their isotopes in the stellar atmosphere and in the galactic environment of the stars. The articles collected in this volume give a modern review of the abundance accuracies for main-sequence stars. After a general introduction in the first part the accuracies of atomic transition probabilities, ionization and excitation cross-sections, and line broad- ening data are discussed. In the second part the specific problems and results for different stellar types are presented, and, finally, an overview on the possibilities of abundance determinations for stars outside the Galaxy is given.
Author : D.S. Hayes
Publisher : Springer Science & Business Media
ISBN 13 : 9400954565
Total Pages : 625 pages
Book Rating : 4.4/5 (9 download)
Download or read book Calibration of Fundamental Stellar Quantities written by D.S. Hayes and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 111th Symposium of the International Astronomical Union held at Villa Olmo, Como, Italy, May 24-29, 1984
Author : L. H. Ahrens
Publisher : Elsevier
ISBN 13 : 1483158152
Total Pages : 1201 pages
Book Rating : 4.4/5 (831 download)
Download or read book Origin and Distribution of the Elements written by L. H. Ahrens and published by Elsevier. This book was released on 2015-12-04 with total page 1201 pages. Available in PDF, EPUB and Kindle. Book excerpt: Origin and Distribution of the Elements, Volume 30 presents detailed studies of trace elements and isotopes and the use of these data with the techniques of physical and organic chemistry to make relevant interpretations in geology. This book discusses some of the problems of applied chemistry. Organized into five sections encompassing 89 chapters, this volume begins with an overview of the theories of nucleosynthesis that are based on broad empirical foundations involving experiment in nuclear physics and observation in geophysics and astronomy. This text then explores the primeval abundance of the elements wherein the composition of the material from which the Galaxy is formed. Other chapters consider the production of helium in the galaxy. This book discusses as well the dynamics of the cores of highly evolved massive stars. The final chapter deals with the measurements of site populations in crystal structures by electron diffraction and X-ray. Physicists, astronomers, geologists, and geochemists will find this book extremely useful.
Author : D. Emerson
Publisher : John Wiley & Sons
ISBN 13 : 9780471976790
Total Pages : 476 pages
Book Rating : 4.9/5 (767 download)
Download or read book Interpreting Astronomical Spectra written by D. Emerson and published by John Wiley & Sons. This book was released on 1998-02-04 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: Da vielen Studenten das Interpretieren astronomischer Spektren anfänglich Schwierigkeiten bereitet, unternimmt dieses Buch den Versuch, die entsprechenden Themenbereiche, Ansätze und Grenzen auf diesem wichtigen Gebiet näher zu beleuchten. Untergliedert in zwei Teile, werden im ersten Teil die Grundlagen und die physikalische Seite behandelt; im zweiten Teil werden dann die Methoden auf verschiedene astronomische Umgebungen angewandt und die Ergebnisse interpretiert. (10/97)
Author : B. Hauck
Publisher : Springer Science & Business Media
ISBN 13 : 9789027706751
Total Pages : 300 pages
Book Rating : 4.7/5 (67 download)
Download or read book Abundance Effects in Classification written by B. Hauck and published by Springer Science & Business Media. This book was released on 1976-09-30 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: The general discussions of the roles of photometric and spectroscopic classification at Cordoba in 1971 (lAU Symposium No. 50), and of the calibration of classification indices at Geneva in 1972 (IAU Symposium No. 54), revealed clearly the steadily in creasing importance of abundance parameters. The multipliCity of these, however, raised so many new problems that it was logical that the 1975 meeting at Lausanne should be concerned with ways in which differences in abundance affect both spectral types and photometric indices. Commissions 29 and 36 joined with Commission 45 in sponsoring this Symposium. Since the date of the meeting came shortly after the formal retirement of Professor William W. Morgan from the University of Chicago, it was quickly agreed that this meeting should be dedicated to him in recognition of his unique contributions to spectral classification. In the opening paper of the Symposium Dr. Bengt Stromgren has summarized these. To his remarks we should add only that it was about 1940 that Morgan first distinguished the group of G- and K-type stars with weak CN bands and metallic lines - stars which have since been recognized as having the abundance of all metals relative to hydrogen much lower than in stars of the solar population. Spectra of two of these, HD 81192 (Boss 2527) and 8 Lep, were later shown as examples of the group in the Yerkes Atlas of 1943.
Author : Ewa Niemczura
Publisher : Springer
ISBN 13 : 331906956X
Total Pages : 312 pages
Book Rating : 4.3/5 (19 download)
Download or read book Determination of Atmospheric Parameters of B-, A-, F- and G-Type Stars written by Ewa Niemczura and published by Springer. This book was released on 2014-07-10 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the theory of stellar atmospheres. Almost everything we know about stars is by analysis of the radiation coming from their atmospheres. Several aspects of astrophysics require accurate atmospheric parameters and abundances. Spectroscopy is one of the most powerful tools at an astronomer’s disposal, allowing the determination of the fundamental parameters of stars: surface temperature, gravity, chemical composition, magnetic field, rotation and turbulence. These can be supplemented by distance measurements or pulsation parameters providing information about stellar interior and stellar evolution, otherwise unavailable. The volume is based on lectures presented at the Wrocław's Spectroscopic School aimed at training young researchers in performing quantitative spectral analysis of low-, mid-, and high-resolution spectra of B, A, and F-type stars.
Author : Roger John Tayler
Publisher : Taylor & Francis Group
ISBN 13 : 9780750302005
Total Pages : 356 pages
Book Rating : 4.3/5 (2 download)
Download or read book Stellar Astrophysics written by Roger John Tayler and published by Taylor & Francis Group. This book was released on 1992 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stellar Astrophysics contains a selection of high-quality papers that illustrate the progress made in research into the structure and evolution of stars. Senior undergraduates, graduates, and researchers can now be brought thoroughly up to date in this exciting and ever-developing branch of astronomy.
Author : Andre Maeder
Publisher : Springer Science & Business Media
ISBN 13 : 3540769498
Total Pages : 832 pages
Book Rating : 4.5/5 (47 download)
Download or read book Physics, Formation and Evolution of Rotating Stars written by Andre Maeder and published by Springer Science & Business Media. This book was released on 2008-12-19 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rotation is ubiquitous at each step of stellar evolution, from star formation to the final stages, and it affects the course of evolution, the timescales and nucleosynthesis. Stellar rotation is also an essential prerequisite for the occurrence of Gamma-Ray Bursts. In this book the author thoroughly examines the basic mechanical and thermal effects of rotation, their influence on mass loss by stellar winds, the effects of differential rotation and its associated instabilities, the relation with magnetic fields and the evolution of the internal and surface rotation. Further, he discusses the numerous observational signatures of rotational effects obtained from spectroscopy and interferometric observations, as well as from chemical abundance determinations, helioseismology and asteroseismology, etc. On an introductory level, this book presents in a didactical way the basic concepts of stellar structure and evolution in "track 1" chapters. The other more specialized chapters form an advanced course on the graduate level and will further serve as a valuable reference work for professional astrophysicists.
