The Bulge Radial Velocity Assay (BRAVA): Final Results, A New High Velocity Star, and Public Data Release

Details The Bulge Radial Velocity Assay (BRAVA): Final Results, A New High Velocity Star, and Public Data Release The Bulge Radial Velocity Assay (BRAVA): Final Results, A New High Velocity Star, and Public Data Release

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21925205r&link_type=abstract

American Astronomical Society, AAS Meeting #219, #252.05

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new radial velocity measurements from the Bulge Radial Velocity Assay (BRAVA), a large scale spectroscopic survey of M-type giants in the Galactic bulge/bar region. The sample of ? new radial velocities, mostly in the region -10 < l < +10 deg and b ≈ -6 deg, more than doubles the existent published data set. The new data confirm the cylindrical rotation observed at -8 deg, and are an excellent fit to the Shen et al. (2010) N-body bar model. We also measure the strength of the TiO epsilon molecular band as a first step towards a metallicity ranking of the stellar sample, from which we confirm the presence of a vertical abundance gradient. We also publish our complete catalog of radial velocities, photometry, TiO-strengths, and spectra, which is available at the IRSA archive.
We also report a possible new high velocity star, the first found in this direction, with radial velocity 447 km/sec, and space velocity 550 km/sec if its distance is 8kpc. The star is a moderately metal poor M giant in the Galactic bulge, and has apogalacticon at least 20 kpc from the nucleus.

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