The evolution of high-metallicity horizontal-branch stars and the origin of the ultraviolet light in elliptical galaxies

Details The evolution of high-metallicity horizontal-branch stars and the origin of the ultraviolet light in elliptical galaxies The evolution of high-metallicity horizontal-branch stars and the origin of the ultraviolet light in elliptical galaxies

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...388l..53h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 388, April 1, 1992, p. L53-L56.

Astronomy and Astrophysics

Astrophysics

86

Asymptotic Giant Branch Stars, Elliptical Galaxies, Galactic Evolution, Hertzsprung-Russell Diagram, Horizontal Branch Stars, Metallic Stars, Galactic Bulge, Helium, Metallicity, Ultraviolet Radiation

Scientific paper

Evolutionary calculations of high-metallicity horizontal-branch stars show that for the relevant masses and helium abundances, post-HB evolution in the HR diagram does not proceed toward and along the AGB, but rather toward a 'slow blue phase' in the vicinity of the helium-burning main sequence, following the extinction of the hydrogen shell energy source. For solar and twice solar metallicity, the blue phase begins during the helium shell-burning phase (in agreement with the work of Brocato and Castellani and Tornambe); for 3 times solar metallicity, it begins earlier, during the helium core-burning phase. This behavior differs from what takes place at lower metallicities. The implications for high-metallicity old stellar populations in the Galactic bulge and for the integrated colors of elliptical galaxies are discussed.

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