Cool Subdwarfs As Tracers Of The Galactic Halo: A Massive Spectroscopic Survey Of Low-mass, Metal-poor Stars In Sdss And Segue.

Details Cool Subdwarfs As Tracers Of The Galactic Halo: A Massive Spectroscopic Survey Of Low-mass, Metal-poor Stars In Sdss And Segue. Cool Subdwarfs As Tracers Of The Galactic Halo: A Massive Spectroscopic Survey Of Low-mass, Metal-poor Stars In Sdss And Segue.

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21330304l&link_type=abstract

American Astronomical Society, AAS Meeting #213, #303.04; Bulletin of the American Astronomical Society, Vol. 41, p.273

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the spectroscopic identification of an unprecedented 6,900 cool subdwarfs (sdM/esdM/usdM) from the Sloan Digital Sky Survey (SDSS) and Sloan Extension for Galactic Understanding and Exploration (SEGUE). The census provides the most detailed picture to date of the local population of old, low-mass stars, including abundances and kinematics. New high signal-to-noise classification templates are generated for each ot the subdwarf (sdM), extreme subdwarf (esdM) and ultrasubdwarf (usdM) metallicity classes. The high sucess rate in the SEGUE target selection algorithm confirms that cool subdwarfs can be very efficiently identified based on color and proper motion alone. We further confirm the earlier assumption that M subdwarfs are segregated according to metallicity in the g-r/r-i color-color diagram, making it possible to identify low-mass metal poor stars with minimal kinematic bias. Kinematics of our sample shows a distribution consistent with a sizable population of metal-poor stars on eccentric Galactic orbits, part of a flattened and co-rotating "inner halo".

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