Distances and Galactic Kinematics of Two Blue Metal-poor Stars

Details Distances and Galactic Kinematics of Two Blue Metal-poor Stars Distances and Galactic Kinematics of Two Blue Metal-poor Stars

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pasp..117.1372c&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 117, Issue 838, pp. 1372-1377.

Other

Stars: Blue Stragglers, Galaxy: Evolution, Stars: Distances, Stars: Kinematics, Stars: Variables: Other

Scientific paper

We use an SX Phe period-luminosity relation to derive distance estimates and Galactic kinematic parameters for the short-period pulsating blue metal-poor stars CS 29499-057 and CS 22966-043. The resulting kinematics are quite distinctive relative to the metal-poor halo field. Even though these two field blue stragglers' binarity is consistent with the idea of formation in a mass transfer system, we speculate that these stars' origin instead lies in a Galactic merger or interaction with a dwarf galaxy satellite, or in the merger of a stellar binary system. The former possibility is consistent with CS 22966-043's significant [α/Fe] deficiency. A non-mass-transfer origin for both binaries is also consistent with (though not necessarily precluded by) the lack of any significant s-process enhancement seen in either star, and the long orbital period of CS 29499-057 that may preclude a mass transfer origin. In an effort to determine distances to additional blue metal-poor stars, we have photometrically monitored CS 22890-069, CS 22872-062, and CS 22884-065. However, the light curves of these three objects indicate no short-period photometric variability at the level of a few hundredths of a magnitude.

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