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
Fourier analysis of non-Blazhko ab-type RR Lyrae stars observed with the Kepler space telescope
J. M. Nemec,Radosław Smolec,József Benkő,P. Moskalik,Katrien Kolenberg,Katrien Kolenberg,Róbert Szabó,D. W. Kurtz,S. T. Bryson,Elisabeth Guggenberger,Merieme Chadid,Y.-B. Jeon,Andrea Kunder,Andrew C. Layden,Karen Kinemuchi,László L. Kiss,E. Poretti,Jørgen Christensen-Dalsgaard,Hans Kjeldsen,D. A. Caldwell,Vincenzo Ripepi,Aliz Derekas,J. Nuspl,Fergal Mullally,Susan E. Thompson,William J. Borucki +25 more
TL;DR: The results of Fourier decomposition of the time-series photometry of these stars acquired during the first 417 d of operation (Q0-Q5) of the Kepler telescope are presented in this article.
Journal ArticleDOI
BV Photometry of the RR Lyrae Variables of the Globular Cluster M3
TL;DR: In this paper, the authors presented new BV CCD photometry, light curves, and ephemerides for 207 RR Lyrae variables in the globular cluster M3.
Journal ArticleDOI
Constraints on helium enhancement in the globular cluster m3 (ngc 5272): the horizontal branch test*
Márcio Catelan,Frank Grundahl,Allen V. Sweigart,A. A. R. Valcarce,Cristián E. Cortés,Cristián E. Cortés +5 more
TL;DR: In this paper, the presence of multiple populations showing various amounts of helium enhancement is a common feature among globular star clusters and it has been suggested that such a helium enhancement would be particularly apparent in the enhanced luminosity of thc blue horizontal branch (HB) stars compared to the red HB stars.
Journal ArticleDOI
An Historical Overview
TL;DR: Extended Horizontal Branch (EHB) stars were identified with ExtremeHorizontal Branch stars in globular clusters as mentioned in this paper, and it was realised that HB and EHB stars must have formed as a consequence of mass-loss on the giant branch, either at or before the helium flash.