The Properties and Kinematics of a Sample of Cool Subdwarfs from SDSS

Details The Properties and Kinematics of a Sample of Cool Subdwarfs from SDSS The Properties and Kinematics of a Sample of Cool Subdwarfs from SDSS

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832610s&link_type=abstract

American Astronomical Society, AAS Meeting #218, #326.10; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a sample of 364 M subdwarfs from the 7th Data Release of the Sloan Digital Sky Survey (DR7; SDSS). This catalog contains stellar coordinates, SDSS magnitudes, spectral classes, radial velocities, proper motions, absolute magnitudes and estimated distances. We discuss the selection criteria, the spectral classification and radial velocity determination processes. We calculate 3D space motions (U,V,W) in the standard Galactic system and place each star in its proper subdwarf subclass (as efined by Lepine et al.). We show that the metal poor populations are moving faster than metal rich stars on average,
consistent with being members of a dynamically heated thick disk or halo. In addition, we present an updated version of the reduced proper motion (RPM) diagram, which is useful for separating low-mass subdwarfs from their M dwarf thin disk counterparts.

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