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The 2MASS Color-Magnitude Diagram of the Center of the Sagittarius Dwarf Galaxy: Photometric Measurements of a Surprisingly High Mean Metallicity

Citation

Cole, AA, The 2MASS Color-Magnitude Diagram of the Center of the Sagittarius Dwarf Galaxy: Photometric Measurements of a Surprisingly High Mean Metallicity, The Astrophysical Journal, 559, (1) pp. L17-L20. ISSN 0004-637X (2001) [Refereed Article]

DOI: doi:10.1086/323723

Abstract

We present the Two Micron All Sky Survey (2MASS) (J-K, K) color-magnitude diagram for the region within 1° of the center of the Sagittarius dwarf spheroidal galaxy. Using the slope of the red giant branch (RGB), we determine a mean metallicity for the main stellar population of [Fe/H] = -0.5 ± 0.2. The Sagittarius RGB possesses a blue tail that overlaps with the foreground Milky Way giant branch and suggests that approximately one-third of the RGB is more metal-poor than [Fe/H] ∼ -1. Direct comparison with the Large Magellanic Cloud confirms the metal-rich nature of the bulk of the Sagittarius population. Our result is marginally consistent with the even higher metallicities determined from high-resolution spectroscopy.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Cole, AA (Dr Andrew Cole)
ID Code:45318
Year Published:2001
Web of Science® Times Cited:27
Deposited By:Physics
Deposited On:2007-07-10
Last Modified:2011-08-03
Downloads:0

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