Stellar populations in local group dwarf elliptical galaxies. I - NGC 147

Details Stellar populations in local group dwarf elliptical galaxies. I - NGC 147 Stellar populations in local group dwarf elliptical galaxies. I - NGC 147

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..471m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 15, 1983, p. 471-484. NASA-supported research.

Astronomy and Astrophysics

Astronomy

103

Dwarf Galaxies, Elliptical Galaxies, Local Group (Astronomy), Metallicity, Star Distribution, Stellar Color, Stellar Magnitude, Astronomical Photometry, Asymptotic Giant Branch Stars, Color-Magnitude Diagram, Distance, Globular Clusters, Milky Way Galaxy, Red Giant Stars, Stellar Evolution

Scientific paper

A color-magnitude diagram of NGC 147 to an I magnitude of 23 is presented. The stellar population in the outer parts of this elliptical galaxy resembles that of the globular clusters of the Milky Way. Quantitative comparison of the giant branch with those of globular clusters yields a mean metallicity of -1.2 + or - 0.2, making NGC 147 a part of the general correlation between mass and metallicity seen in ellipticals. The giant branch appears to be broad, which suggests a metallicity dispersion. The absence of asymptotic giant branch stars at luminosities above that of the red giant branch tip sets an upper limit of 10 percent for the fraction of stars in this NGC 147 field that have ages less than 12 Gyr. This result contrasts with the situation in some of the related, but less massive, dwarf spheroidal systems. If the choice is made to assume, rather than determine the stellar content of NGC 147, a distance of 630 + or - 50 kpc is derived, similar to that of M31.

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