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The Universal Stellar Mass-Stellar Metallicity Relation for Dwarf Galaxies
Evan N. Kirby, Judith G. Cohen, Puragra Guhathakurta +3
We present spectroscopic metallicities of individual stars in seven gas-rich dwarf irregular galaxies (dIrrs), and we show that dIrrs obey the same mass-metallicity relation as the…
Normal and Outlying Populations of the Milky Way Stellar Halo at [Fe/H] < -2
Judith Cohen, Norbert Christlieb, Ian Thompson +5
From detailed abundance analysis of >100 Hamburg/ESO candidate extremely metal-poor (EMP) stars we find 45 with [Fe/H] < -3.0 dex. We identify a heretofore unidentified group: Ca-d…
Tracing the Orphan Stream to 55 kpc with RR Lyrae Stars
Branimir Sesar, Carl J. Grillmair, Judith G. Cohen +10
We report positions, velocities and metallicities of 50 ab-type RR Lyrae (RRab) stars observed in the vicinity of the Orphan stellar stream. Using about 30 RRab stars classified as…