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RR Lyrae stars in the Bootes structure

Published online by Cambridge University Press:  01 December 2006

M. Dall'Ora ,
G. Clementini ,
K. Kinemuchi ,
V. Ripepi ,
M. Marconi ,
M. Di Criscienzo ,
L. Di Fabrizio ,
C. Greco ,
C. T. Rodgers  and
C. Kuehn
...Show all authors
M. Dall'Ora
Affiliation:
INAF – Osservatorio Astronomico di Capodimonte, via Moiariello 16, I-80131, Napoli, Italy email: dallora@oacn.inaf.it, ripepi@oacn.inaf.it, marconi@oacn.inaf.it, dicrisci@oacn.inaf.it
G. Clementini
Affiliation:
INAF – Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127, Bologna, Italy email: gisella.clementini@oabo.inaf.it, claudia.greco@oabo.inaf.it
K. Kinemuchi
Affiliation:
University of Wyoming, Department of Physics and Astronomy, Department 3905, Laramie, WY 82071 email: kinemuch@uwyo.edu, crodgers@uwyo.edu
V. Ripepi
Affiliation:
INAF – Osservatorio Astronomico di Capodimonte, via Moiariello 16, I-80131, Napoli, Italy email: dallora@oacn.inaf.it, ripepi@oacn.inaf.it, marconi@oacn.inaf.it, dicrisci@oacn.inaf.it
M. Marconi
Affiliation:
INAF – Osservatorio Astronomico di Capodimonte, via Moiariello 16, I-80131, Napoli, Italy email: dallora@oacn.inaf.it, ripepi@oacn.inaf.it, marconi@oacn.inaf.it, dicrisci@oacn.inaf.it
M. Di Criscienzo
Affiliation:
INAF – Osservatorio Astronomico di Capodimonte, via Moiariello 16, I-80131, Napoli, Italy email: dallora@oacn.inaf.it, ripepi@oacn.inaf.it, marconi@oacn.inaf.it, dicrisci@oacn.inaf.it
L. Di Fabrizio
Affiliation:
INAF, Centro Galileo Galilei and Telescopio Nazionale Galileo, P.O. Box 565, 38700 Santa Cruz de La Palma, Spain email: difabrizio@tng.iac.es
C. Greco
Affiliation:
INAF – Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127, Bologna, Italy email: gisella.clementini@oabo.inaf.it, claudia.greco@oabo.inaf.it
C. T. Rodgers
Affiliation:
University of Wyoming, Department of Physics and Astronomy, Department 3905, Laramie, WY 82071 email: kinemuch@uwyo.edu, crodgers@uwyo.edu
C. Kuehn
Affiliation:
Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-2320, email: kuehn@pa.msu.edu, smith@pa.msu.edu
H. A. Smith
Affiliation:
Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-2320, email: kuehn@pa.msu.edu, smith@pa.msu.edu
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Abstract

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V, I time-series photometry of the new Milky Way satellite recently discovered in the Bootes constellation (Belokurov et al. 2006) was collected at the TNG, WIRO and Loiano telescopes and used to search for variable stars. We have identified a non-negligible population of RR Lyrae variables, which confirms the presence of an old population in this newly discovered structure. The distribution of periods coupled with information on the evolutionary status of the system derived fromthe color-magnitude diagram provide important hints on the nature and history of this intriguing new companion of the Milky Way.

Keywords

galaxies: distances and redshifts – galaxies: dwarf – galaxies: individual (Bootes) – stars: horizontal-branch – stars: variables: other – techniques: photometric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S241: Stellar Populations as Building Blocks of Galaxies , December 2006 , pp. 331 - 332
Copyright
Copyright © International Astronomical Union 2007

References

Belokurov, V., et al. 2006, ApJ 647, L111Google Scholar
Dall'Ora, M. et al. , 2006, ApJ 653, L109Google Scholar
Munoz, R.R. et al. , 2006, ApJ 650, L51Google Scholar
Siegel, M.H. 2006, ApJ 649, L83Google Scholar