Searching for RR Lyrae stars in the Canis Major Overdensity

Details Searching for RR Lyrae stars in the Canis Major Overdensity Searching for RR Lyrae stars in the Canis Major Overdensity

2007-02-05

arxiv.org/abs/astro-ph/0702115v2

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure, to appear in the proceedings of IAU Symposium No241 "Stellar Populations as Building Blocks of Galaxies"

Scientific paper

10.1017/S1743921307008459

The Canis Major overdensity (CMa) was initially proposed to be the remnant of a tidally disrupting dSph galaxy. Since its nature is still subject of debate, the goal of the present work was to conduct a large-scale RR Lyrae survey in CMa, in order to see if there is an overdensity of these stars. The survey spans a total area of ~34 sq. deg. with observations in V and R filters, made with the 1.0m Jurgen Stock Schmidt telescope at the National Astronomical Observatory of Venezuela. Current results in a subregion, including spectroscopic observations, show that the small number of RR Lyrae stars found can be accounted for by the halo and thick disk components of our Galaxy.

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