Bibcode
Nevils, G. K.; Newberg, H. N.; Allende Prieto, C.; Beers, T. B.; Lee, Y. L.; Thirupathi, S. L.; Wilhelm, R. W.; Yanny, B. Y.
Referencia bibliográfica
American Astronomical Society Meeting 207, #131.05; Bulletin of the American Astronomical Society, Vol. 37, p.1378
Fecha de publicación:
12
2005
Número de citas
0
Número de citas referidas
0
Descripción
Using a sample of 654 objects selected from the Sloan Digital Sky Survey
(SEGUE) plates, we evaluated and adjusted the SDSS target algorithm for
Blue Horizontal Branch (BHB) stars. We then tested the spectroscopically
determined surface gravity for these stars against the Lenz et al. 1998
photometric ``v-parameter" = 0.283(u-g) - 0.354(g-r) + 0.455(r-i) +
0.766(i-z). Spectroscopic and photometric determinations of the surface
gravity agreed within 0.35 dex. Using surface gravity and g-r color, we
estimated the distance from the center of the Galaxy and the height off
of the Galactic plane for each star. We compare the galactocentric
radial velocities of our star sample with known radial velocity models
of the Galactic Halo. The 76 objects located at galactic latitudes (b)
of -20° and galactic longitude (l) of 110° match in coordinates,
distance from the Sun and radial velocity the model of the Monoceros
tidal stream.
G.K.N. was supported by an REU program at Rensselaer Polytechnic
Institute, NSF grant PHYS 04-53231. H.J.N and G.K.N. acknowledge support
from NSF grant AST 03-07571. T.C.B., S.T., and Y.L. acknowledge support
from NSF grant AST 04-06784, as well as from NSF grant PHY 02-16783,
Physics Frontier Center/Joint Institute for Nuclear Astrophysics (JINA).