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2007MNRAS.377.1520H - Mon. Not. R. Astron. Soc., 377, 1520-1530 (2007/June-1)
Evolutionary models for two hyper-iron-poor low-mass stars.
HARRIS G.J., PORTER R., LYNAS-GRAY A.E. and TENNYSON J.
Abstract (from CDS):
It is not possible to unambiguously identify the origin, evolutionary stage or mass for either star with the present observational data. Our evolutionary models indicate that HE0107-5240 is either a red giant or a subgiant close to the base of the red giant branch. In line with the study of Aoki et al., HE1327-2326 is found to be either a main-sequence or a subgiant star. If HE1327-2326 is a main-sequence star the fits indicate that it must have a mass less than 0.8 M☉; if the star is assumed to have an age of around 12.5 Gyr it will have a mass closer to 0.7 M☉.
Main-sequence low-mass model Population III stars which have been polluted with metals are found to closely resemble Population II stars. However, the case is different for subgiants. The polluted and unpolluted Population III subgiants have luminosity up to twice that of a comparable Population II model. If HE1327-2326 is a subgiant, its distance is measured and if its mass can be reasonably well constrained, it should be possible to determine if it is a Population II or III star.
Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s): stars: abundances - stars: atmospheres - stars: carbon - stars: evolution - stars: low-mass, brown dwarfs
Simbad objects: 2
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