Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411l..67j&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 411, no. 2, p. L67-L70.
Astronomy and Astrophysics
Astrophysics
11
Elliptical Galaxies, Metallicity, Stellar Evolution, Ultraviolet Radiation, Horizontal Branch Stars, Stellar Mass Ejection
Scientific paper
The method of Jorgensen (1991) and Jorgensen and Thejll (1993), which allows a fast and accurate evaluation of the evolution of low-mass stars in a continuous range of metallicities, is used to examine the conditions for progenitors of UV-bright asymptotic giant branch (AGB) manque stars to form in galaxies of various metallicities. In particular, it is found that, among the recently published zero-age horizontal branch (ZAHB) models identified as potential progenitors for the 'slow blue' AGB manque stars, only those of the AGB models that have the ratio R (R = the helium enrichment relative to metallicity enrichment) slightly above the solar value can have evolved into the horizontal-branch phase within the present age of the universe (with a reasonable amount of mass loss at the red giant branch). Only these stars show the necessary functional number increase with metallicity.
Jorgensen Uffe G.
Thejll Peter
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