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Article Dans Une Revue The Astrophysical journal letters Année : 2009

A Photometric Metallicity Estimate of the Virgo Stellar Overdensity

Résumé

We determine photometric metal abundance estimates for individual main-sequence stars in the Virgo Overdensity (VOD), which covers almost 1000 °^2 on the sky, based on a calibration of the metallicity sensitivity of stellar isochrones in the gri filter passbands using field stars with well-determined spectroscopic metal abundances. Despite the low precision of the method for individual stars, we derive [Fe/H] = -2.0 ± 0.1(internal) ± 0.5(systematic) for the metal abundance of the VOD from photometric measurements of 0.7 million stars in the northern Galactic hemisphere with heliocentric distances from ~10 kpc to ~20 kpc. The metallicity of the VOD is indistinguishable, within Delta[Fe/H]

Dates et versions

hal-03786129 , version 1 (23-09-2022)

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Deokkeun An, Jennifer A. Johnson, Timothy C. Beers, Marc H. Pinsonneault, Donald M. Terndrup, et al.. A Photometric Metallicity Estimate of the Virgo Stellar Overdensity. The Astrophysical journal letters, 2009, 707, pp.L64-L68. ⟨10.1088/0004-637X/707/1/L64⟩. ⟨hal-03786129⟩
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