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Title:
Stellar Populations in the Andromeda V Dwarf Spheroidal Galaxy
Authors:
Mancone, Conor; Sarajedini, Ata
Affiliation:
AA(Department of Astronomy, University of Florida, Gainesville, FL 32611, USA ), AB(Department of Astronomy, University of Florida, Gainesville, FL 32611, USA )
Publication:
The Astronomical Journal, Volume 136, Issue 5, pp. 1913-1920 (2008). (AJ Homepage)
Publication Date:
11/2008
Origin:
IOP
AJ Keywords:
galaxies: individual: Andromeda V, galaxies: spiral, galaxies: stellar content, stars: variables: other
DOI:
10.1088/0004-6256/136/5/1913
Bibliographic Code:
2008AJ....136.1913M

Abstract

Using archival imaging from the Wide Field Planetary Camera 2 aboard the Hubble Space Telescope, we investigate the stellar populations of the Local Group dwarf spheroidal Andromeda V—a companion satellite galaxy of M31. The color-magnitude diagram extends from above the first ascent red giant branch (RGB) tip to approximately 1 mag below the horizontal branch (HB). The steep well-defined RGB is indicative of a metal-poor system while the HB is populated predominantly redward of the RR Lyrae instability strip. Utilizing Galactic globular cluster fiducial sequences as a reference, we calculate a mean metallicity of [Fe/H] = -2.20 ± 0.15 and a distance of (m - M)0 = 24.57 ± 0.04 after adopting a reddening of E(B - V) = 0.16. This metal abundance places And V squarely in the absolute magnitude-metallicity diagram for dwarf spheroidal galaxies. In addition, if we attribute the entire error-corrected color spread of the RGB stars to an abundance spread, we estimate a range of ~0.5 dex in the metallicities of And V stars. Our analysis of the variable-star population of And V reveals the presence of 28 potential variables. Of these, at least 10 are almost certainly RR Lyrae stars based on their time sequence photometry.

Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute.

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