Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...389..227c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 389, April 10, 1992, p. 227-233. Research supported by CNR and CSIC.
Astronomy and Astrophysics
Astrophysics
23
Asymptotic Giant Branch Stars, Elliptical Galaxies, Galactic Radiation, Red Giant Stars, Stellar Cores, Stellar Evolution, Ultraviolet Radiation, Chemical Composition, Mass To Light Ratios, Metallicity, Spectral Energy Distribution, Stellar Envelopes, Stellar Luminosity
Scientific paper
An extensive analysis is presented of the post red giant branch (RGB), the post early asymptotic giant branch (EAGB), and the post asymptotic giant branch (AGB) evolutionary phases in order to derive information on their UV light contribution to the spectral energy distribution of old stellar systems. The effect of the surface chemical composition on the well-known correlation between the luminosity and the critical envelope mass, below which a star evolving along the Hayashi track is forced to turn back to the blue, is investigated. The surface metallicity is found to represent an additional parameter which should be accounted for in the critical hydrogen envelope mass luminosity relation. The correlation between the core mass and the hydrogen fuel to be burned above a certain temperature along the blueward excursion is discussed. For low core masses (post-RGB stars) and large core masses (post-AGB stars) there is one single correlation linking the fuel with the core mass, whereas for intermediate core masses (post-EAGB stars), the fuel correlates with the core quite differently, turning out to be much larger than in the two adjacent cases.
Castellani Marco
Limongi Marco
Tornambe' Amedeo
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