The M31 Dwarf Spheroidal Companion Andromeda V: g', r', and i' Imaging with the Gemini Multi-Object Spectrograph on Gemini North

Details The M31 Dwarf Spheroidal Companion Andromeda V: g', r', and i' Imaging with the Gemini Multi-Object Spectrograph on Gemini North The M31 Dwarf Spheroidal Companion Andromeda V: g', r', and i' Imaging with the Gemini Multi-Object Spectrograph on Gemini North

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aj....124..886d&link_type=abstract

The Astronomical Journal, Volume 124, Issue 2, pp. 886-895.

Astronomy and Astrophysics

Astronomy

11

Galaxies: Dwarf, Galaxies: Individual: Name: Andromeda V, Galaxies: Stellar Content, Galaxies: Local Group

Scientific paper

Images obtained in g', r', and i' with the Gemini Multi-Object Spectrograph (GMOS) on Gemini North are used to investigate the metallicity and stellar content of the M31 dwarf spheroidal companion galaxy Andromeda V. Red giant branch (RGB) stars are traced out to radii in excess of 126" from the galaxy center, indicating that And V extends over a diameter approaching 1 kpc. The mean g'-i' color of the RGB does not change with radius. Based on the slope of the RGB in the (i', g'-i') color-magnitude diagram, we conclude that the metallicity of And V is [Fe/H]=-2.2+/-0.1. This is lower than earlier estimates and places And V squarely on the relation between metallicity and integrated brightness defined by other dwarf spheroidal and dwarf elliptical galaxies. In contrast to many of the Galaxy's dwarf spheroidal companions, there is no evidence for a statistically significant population of luminous asymptotic giant branch stars near the center of the galaxy. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Particle Physics and Astronomy Research Council (United Kingdom), the National Research Council of Canada (Canada), CONICYT (Chile), the Australian Research Council (Australia), CNPq (Brazil), and CONICET (Argentina).

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