The stellar content of dwarf spheroidal galaxies

Details The stellar content of dwarf spheroidal galaxies The stellar content of dwarf spheroidal galaxies

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241..111h&link_type=abstract

Astrophysical Journal, Part 1, vol. 241, Oct. 1, 1980, p. 111-124.

Astronomy and Astrophysics

Astrophysics

35

Cepheid Variables, Galactic Structure, Star Distribution, Stellar Models, Galactic Evolution, Mass Transfer, Stellar Evolution, Stellar Mass

Scientific paper

The stellar content of dwarf spheroidal galaxies has been investigated with an emphasis on determining the nature of the anomalous Cepheid variables. Models of extremely metal-poor horizontal branch stars in the mass range 0.70-1.60 solar masses have been constructed. It is found that the models with masses of 1.30-1.60 solar masses spend considerable time within the instability strip and successfully predict the observational characteristics of the anomalous Cepheids. The results support binary mass transfer as the origin of the anomalous Cepheids. If so, Draco is probably younger than the majority of Galactic globular clusters. Age is held to be the second parameter affecting the horizontal branch distribution in the color-magnitude diagrams of dwarf spheroidal galaxies.

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