The stellar population structure of the Galactic disk

18 Sep 2015 Jo Bovy Hans-Walter Rix Edward F. Schlafly David L. Nidever Jon A. Holtzman Matthew Shetrone Timothy C. Beers

The spatial structure of stellar populations with different chemical abundances in the Milky Way contains a wealth of information on Galactic evolution over cosmic time. We use data on 14,699 red-clump stars from the APOGEE survey, covering 4 kpc <~ R <~ 15 kpc, to determine the structure of mono-abundance populations (MAPs)---stars in narrow bins in [a/Fe] and [Fe/H]---accounting for the complex effects of the APOGEE selection function and the spatially-variable dust obscuration... (read more)

PDF Abstract