Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1377e&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 101, April 1991, p. 1377-1407. Pennsylvania State University-supported research.
Astronomy and Astrophysics
Astronomy
23
Asymptotic Giant Branch Stars, Milky Way Galaxy, Red Giant Stars, Astronomical Models, Hertzsprung-Russell Diagram, Open Clusters, Stellar Luminosity, Stellar Mass, Stellar Spectrophotometry
Scientific paper
The properties of the brightest red stars in several aggregates in the Galaxy are compared with theoretical models. 22 asymptotic giant branch (AGB) stars are identified, four of which are in the thermally pulsing AGB (TPAGB) phase and four of which are TPAGB carbon stars. Also, four cases of RGB stars are identified which have accreted substantial mass from the carbon-rich TPAGB precursor of a current white dwarf companion. There is general agreement between the observed and theoretical slopes of the RGB and early AGB branches, and quantitative differences between the positioning of observed sequences can be understood in terms of differences in metallicity and mass predicted by the theory.
Eggen Olin J.
Iben Icko Jr.
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