Stellar populations in local group dwarf elliptical galaxies. II - NGC 205

Astronomy and Astrophysics – Astronomy

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Astronomical Photometry, Dwarf Galaxies, Elliptical Galaxies, Local Group (Astronomy), Star Distribution, Andromeda Galaxy, Astronomical Catalogs, Charge Coupled Devices, Globular Clusters, Mass To Light Ratios, Metallicity, Red Giant Stars, Stellar Luminosity

Scientific paper

NGC 205, a dwarf elliptical companion of M31, was studied using deep CCD photometry on the VRI system. Consideration is given to a comparison between the giant branch and the Galactic globular clusters, the degree of chemical enrichment in the outer parts of NGC 204, and the setting of constraints on the stellar population of NGC 205. Should the distance of the galaxy be that of M31, this field's stellar population is extremely old. If star formation in NGC 205 is a recurring phenomenon, it is confined to the interior of the galaxy. Should the stellar population of NGC 205 be as old as Galactic globular clusters, its distance modulus is 24.3 + or - 0.2. The giant branch location corresponds to a mean metallicity greater than or equal to -0.9 + or - 0.2, and a metallicity dispersion is determined to be sigma greater than or equal to 0.5 dex. Also noted is that the color distribution at a given luminosity appears to be positively skewed.

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