Abundance Determinations In Stellar Spectra
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Abundance Determinations In Stellar Spectra
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Author : H. Hubenet
language : en
Publisher:
Release Date : 1966
Abundance Determinations In Stellar Spectra written by H. Hubenet and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Astronomical spectroscopy categories.
Abundance Determinations In Stellar Spectra
DOWNLOAD
Author : H. Hubenet
language : en
Publisher:
Release Date : 1966
Abundance Determinations In Stellar Spectra written by H. Hubenet and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with categories.
Abundance Determinations In Stellar Spectra
DOWNLOAD
Author : H. Hubenet
language : en
Publisher:
Release Date : 1966
Abundance Determinations In Stellar Spectra written by H. Hubenet and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with categories.
Symposium On Abundance Determinations In Stellar Spectra Held In Utrecht The Netherlands 10 14 Aug 1964
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Author : International Astronomical Union
language : en
Publisher:
Release Date : 1966
Symposium On Abundance Determinations In Stellar Spectra Held In Utrecht The Netherlands 10 14 Aug 1964 written by International Astronomical Union and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with categories.
Abundance Determinations In Stellar Spectra
DOWNLOAD
Author : H. Hubenet
language : en
Publisher:
Release Date : 1966
Abundance Determinations In Stellar Spectra written by H. Hubenet and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with categories.
Abundance Determinations In Stellar Spectra
DOWNLOAD
Author : International Astronomical Union
language : en
Publisher:
Release Date : 1966
Abundance Determinations In Stellar Spectra written by International Astronomical Union and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Astrophysics categories.
Abundance Determination In Stellar Spectra
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Author : Lawrence H. Aller
language : en
Publisher:
Release Date : 1966
Abundance Determination In Stellar Spectra written by Lawrence H. Aller and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with categories.
Eso Workshop On Methods Of Abundance Determination For Stars
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Author : P. E. Nissen
language : en
Publisher:
Release Date : 1980
Eso Workshop On Methods Of Abundance Determination For Stars written by P. E. Nissen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Astronomical spectroscopy categories.
An Atomic Physics Viewpoint Of Stellar Abundance Analysis
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Author : Jennifer S. Sobeck
language : en
Publisher:
Release Date : 2007
An Atomic Physics Viewpoint Of Stellar Abundance Analysis written by Jennifer S. Sobeck and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
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).
Accuracy Of Element Abundances From Stellar Atmospheres
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Author : International Astronomical Union. General Assembly
language : en
Publisher: Springer
Release Date : 1990-03-21
Accuracy Of Element Abundances From Stellar Atmospheres written by International Astronomical Union. General Assembly and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990-03-21 with Science categories.
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.