Spectroscopic Survey of the Grid Giant Star Survey

Details Spectroscopic Survey of the Grid Giant Star Survey Spectroscopic Survey of the Grid Giant Star Survey

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop..407m&link_type=abstract

NOAO Proposal ID #2002B-0407

Astronomy and Astrophysics

Astronomy

Scientific paper

We propose to measure radial velocities, abundances, and gravities for halo and thick disk giant and HB star candidates identified through a separate photometric survey. The NASA-sponsored Grid Giant Star Survey (GGSS) to find V~12, 5-10 kpc distant giant stars for the Astrometric Grid of the Space Interferometry Mission (SIM) has created a large, systematically assembled catalogue of V≲17.5 giant and HB star candidates. M_V~ -2, metal poor giants at V=17 probe to > 50 kpc. The final catalogue of ~70,000 giant and HB stars provides an unparalleled database for studying the structure, substructure, and chemodynamics of the Milky Way in all directions of the sky. We propose to continue a pilot program of HYDRA spectroscopy of giants and HB stars in 4% of GGSS fields to: (1) assess the richness of GGSS+HYDRA data for probing stellar populations and halo substructure and (2) explore the region where the Sloan Survey has found evidence for a northern extension of the Sgr dSph, and which includes fields where we have found evidence of a new tidal stream, possibly a foreground, > 360°-wrapped Sgr arm. The several thousand new giant/HB spectra will allow us to verify both of these tantalizing tidal debris findings.

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