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
On a new theoretical framework for RR Lyrae stars I: the metallicity dependence
Marcella Marconi,G. Coppola,Giuseppe Bono,Giuseppe Bono,Vittorio F. Braga,Vittorio F. Braga,Adriano Pietrinferni,R. Buonanno,R. Buonanno,Marco Castellani,I. Musella,Vincenzo Ripepi,R. F. Stellingwerf +12 more
TL;DR: In this paper, a nonlinear, time-dependent convective hydrodynamical model of RR Lyrae stars is presented, assuming a constant helium-to-metal enrichment ratio and a broad range in metal abundances (Z = 0.0001-0.02).
Journal ArticleDOI
Some remarks on the level of helium enhancement among M3's horizontal-branch stars
TL;DR: In this paper, the optimum ranges of applicability (in terms of the $T_{eff}$ range covered by the horizontal branch (HB) stars) for visual and near-UV CMDs, as far as application of this HB $Y$ test goes.
Journal ArticleDOI
IRAS Detections of Metal‐poor Red Giants
TL;DR: In this article, a number of relatively bright metal-poor red giants from the HD and BD catalogs are found to have been detected by the IRAS satellite, and the majority of these stars fall along relatively well-defined sequences in plots of V-[12] versus B - V and V - I.
Journal ArticleDOI
Hubble Space Telescope Observations of Chromospheric Emission from the Population II Red Giant HD 216143
Graeme H. Smith,Andrea K. Dupree +1 more
TL;DR: In this article, spectra of the 2800 A Mg II lines of the metal-poor halo red giant HD 216143 have been obtained with the Goddard High Resolution Spectrograph on the Hubble Space Telescope.
Journal ArticleDOI
Structure and evolution of pulsating hot subdwarfs
TL;DR: In this paper, the origin of hot subdwarfs has been studied from seismic fit data, revealing details of their global and internal structure, and providing important constraints on the origins of hot HB stars.