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Low-mass, helium-enriched PG1159 stars: a possible evolutionary origin and the implications for their pulsational stability properties
(EDP Sciences, 2007-12)
Aims. We examine a recently-proposed evolutionary scenario that could explain the existence of the low-mass, helium-enriched PG 1159 stars. We focus in particular on studying the pulsational stability properties of the ...
A catalog of rotational and radial velocities for evolved starsA catalog of rotational and radial velocities for evolved stars
(EDP Sciences, 2006-07-20)
Aims.The present paper describes the first results of an observational program intended to refine and extend the existing measurements of metal-poor stars, with an emphasis on field evolved stars. Methods.The survey was ...