Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21110403h&link_type=abstract
American Astronomical Society, AAS Meeting #211, #104.03; Bulletin of the American Astronomical Society, Vol. 39, p.924
Other
Scientific paper
This project uses samples of stars taken from the sixth data release of the Sloan Digital Sky Survey (SDSS) and the Sloan Extension for Galactic Understanding and Exploration (SEGUE) to find structure in the spheroid of the Milky Way galaxy. Blue horizontal branch (BHB) stars were selected using color cutoffs of -0.3 < (g-r)0 < 0.0 and 0.8 < (u-g)0 < 1.5, and blue straggler (BS) stars were removed from the sample by eliminating stars with a high surface gravity. All magnitudes have been corrected for extinction. These search parameters found a sample of 4866 BHB stars. The BHB star sample was then used to trace the movements of the stellar components of the spheroid, using a dynamical approach where the distance and velocities of stars are used to search for stellar tidal streams. These streams are characterized by having similar line of sight velocities and distances from the Sun within a relatively small area of the sky. This same BHB star sample, along with another sample selected from the color cutoff of 0.1 < (g-r)0 < 0.4, were used to investigate spheroid and thick disk rotation. This project is funded by the National Science Foundation under grant number AST 06-07618.
Harrigan Matthew
Newberg Heidi
Yanny Brian
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