Stellar Density and Metallicity Distributions of RR Lyrae and Main-Sequence Stars from the SDSS Stripe 82

Details Stellar Density and Metallicity Distributions of RR Lyrae and Main-Sequence Stars from the SDSS Stripe 82 Stellar Density and Metallicity Distributions of RR Lyrae and Main-Sequence Stars from the SDSS Stripe 82

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21531005s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #310.05; Bulletin of the American Astronomical Society, Vol. 42, p.308

Astronomy and Astrophysics

Astronomy

Scientific paper

We present an improved analysis of halo substructure traced by RR Lyrae and main-sequence stars in the SDSS stripe 82 region. Using a sample of 483 RR Lyrae stars we find that the spatial distribution of halo stars at galactocentric distances 5-100 kpc is highly inhomogeneous. We present strong direct evidence, based on both RR Lyrae stars and main-sequence stars, that the halo stellar number density profile significantly steepens beyond 30 kpc from the Galactic center. By using a novel method that simultaneously combines observations of RR Lyrae and main-sequence stars, and using photometric metallicity estimates for main-sequence stars derived from deep co-added u-band data, we measure the metallicity of the Sagittarius dSph tidal stream (trailing arm) to be 0.3 dex higher ([Fe/H]=-1.2) than that of surrounding halo field stars.

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