Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.210..731j&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 210, Oct. 1, 1984, p. 731-743. Research supported by th
Astronomy and Astrophysics
Astronomy
18
B Stars, Horizontal Branch Stars, Stellar Evolution, Stellar Models, Variable Stars, Abundance, Main Sequence Stars, Radiant Flux Density, Stellar Envelopes, Stellar Luminosity, Stellar Temperature, Surface Temperature
Scientific paper
Zero-age models and evolutionary sequences for horizontal-branch stars with very low envelope hydrogen abundances (X less than 0.01) have been constructed. Models with a helium core mass of 0.475 solar mass reproduce the observed luminosity and surface temperature of the pulsating helium star BD + 13 deg 3224 (V652 Her) very well. The rate of period decrease of BD + 13 deg 3224 can also be reproduced by considering the contraction of the models as they evolve from their zero-age position towards the Helium Main Sequence.
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