Journal ArticleDOI
Metal-poor stars. III - On the evolution of horizontal-branch stars
Icko Iben,Robert T. Rood +1 more
TLDR
Horizontal branch stars evolution based on mass distributions from comparison with giant branch, investigating evolutionary track characteristics during core helium burning was studied in this paper, where the authors proposed a model of the evolution of horizontal branch stars.Abstract:
Horizontal branch stars evolution based on mass distributions from comparison with giant branch, investigating evolutionary track characteristics during core helium burningread more
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Journal ArticleDOI
Single star evolution I. Massive stars and early evolution of low and intermediate mass stars
Icko Iben,Alvio Renzini +1 more
TL;DR: In this article, the authors survey the results of those model calculations of the early evolution of single stars that have been obtained over approximately the last decade, and compare some of these results with the observations, concentrating particularly on the comparison between theoretical predictions regarding surface abundances of red giants and Cepheids and abundance estimates obtained by spectral data.
Journal ArticleDOI
Stellar Evolution in NGC 6791: Mass Loss on the Red Giant Branch and the Formation of Low-Mass White Dwarfs* **
Jasonjot S. Kalirai,Pierre Bergeron,Brad M. S. Hansen,Daniel D. Kelson,David B. Reitzel,R. Michael Rich,Harvey B. Richer +6 more
TL;DR: In this paper, a detailed study of the properties (temperatures, gravities, and masses) of the NGC 6791 white dwarf population is presented, which provides direct empirical evidence that mass loss is much more efficient in high-metallicity environments and therefore may be critical in interpreting the ultraviolet upturn in elliptical galaxies.
Journal ArticleDOI
Stellar Evolution in NGC 6791: Mass Loss on the Red Giant Branch and the Formation of Low Mass White Dwarfs
Jasonjot S. Kalirai,Pierre Bergeron,Brad M. S. Hansen,Daniel D. Kelson,David B. Reitzel,R. Michael Rich,Harvey B. Richer +6 more
TL;DR: In this paper, a detailed study of the properties (temperatures, gravities, and masses) of the NGC 6791 white dwarf population is presented, and it is shown that at least 40% of the evolved stars must have lost enough mass on the red giant branch to avoid the flash, and therefore did not convert helium into carbon-oxygen in their core.
Journal ArticleDOI
Variable Stars in the Unusual, Metal-Rich Globular Cluster NGC 6388
TL;DR: In this paper, a search for variable stars in the metal-rich globular cluster NGC 6388, using time-series BV photometry, has been undertaken, and twenty-eight new variables were found in this survey, increasing the total number of variables found near the cluster to ~57.
Journal ArticleDOI
The horizontal branch in the UV colour–magnitude diagrams – II. The case of M3, M13 and M79
Emanuele Dalessandro,Maurizio Salaris,Francesco R. Ferraro,Alessio Mucciarelli,Santi Cassisi +4 more
TL;DR: In this article, a detailed comparison between far-ultraviolet (UV)/optical color-magnitude diagrams obtained with high-resolution Hubble Space Telescope data and suitable theoretical models for three Galactic globular clusters: M3, M13 and M79 is presented.