BVI photometry of stars in the outer regions of M32

Astronomy and Astrophysics – Astronomy

Scientific paper

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Asymptotic Giant Branch Stars, Local Group (Astronomy), Metallicity, Stellar Color, Stellar Composition, Stellar Spectrophotometry, Compact Galaxies, Elliptical Galaxies, Stellar Luminosity

Scientific paper

The stellar content of a field 100 arcsec from the center of M32 is investigated. A comparison of color-magnitude diagrams and giant branch color distributions with globular cluster sequences indicates that a significant metallicity dispersion is present in the observed field and that the dominant component is moderately metal poor, with (Fe/H) about -1.3. The V and I luminosity functions and the luminosity function of AGB stars reveal that the AGB tip occurs near M(bol) about -4.5, a value consistent with an old moderately metal-poor population. The implications of the findings for the origin and evolution of cE systems are considered.

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