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Searching for RR Lyrae stars in the Canis Major overdensity

Published online by Cambridge University Press:  01 December 2006

C. Mateu ,
K. Vivas ,
R. Zinn  and
L. Miller
C. Mateu
Affiliation:
Centro de Investigaciones de Astronomía (CIDA), Mérida, Venezuela Facultad de Ciencias, Universidad Central de Venezuela, Caracas, Venezuela
K. Vivas
Affiliation:
Centro de Investigaciones de Astronomía (CIDA), Mérida, Venezuela
R. Zinn
Affiliation:
Astronomy Department, Yale University, New Haven, USA.
L. Miller
Affiliation:
Astronomy Department, Yale University, New Haven, USA.
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Abstract

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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 Jürgen 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.

Keywords

Galaxy: structureGalaxy: stellar contentstars: variables: RR Lyrae
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S241: Stellar Populations as Building Blocks of Galaxies , December 2006 , pp. 359 - 360
Copyright
Copyright © International Astronomical Union 2007

References

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