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XMM-Newton and Chandra Observations of Neutron Stars and Cataclysmic Variables in the Globular Cluster NGC 2808

Published online by Cambridge University Press:  01 September 2007

M. Servillat ,
N. A. Webb ,
D. Barret ,
R. Cornelisse ,
A. Dieball ,
C. Knigge ,
K. S. Long ,
M. M. Shara  and
D. R. Zurek
M. Servillat
Affiliation:
CESR, CNRS, Université Paul Sabatier, Toulouse, France email: [email protected]
N. A. Webb
Affiliation:
CESR, CNRS, Université Paul Sabatier, Toulouse, France email: [email protected]
D. Barret
Affiliation:
CESR, CNRS, Université Paul Sabatier, Toulouse, France email: [email protected]
R. Cornelisse
Affiliation:
Instituto de Astrofisica de Canarias, Santa Cruz de Tenerife, Spain
A. Dieball
Affiliation:
School of Physics and Astronomy, University of Southampton, UK
C. Knigge
Affiliation:
School of Physics and Astronomy, University of Southampton, UK
K. S. Long
Affiliation:
Space Telescope Science Institute, Baltimore, USA
M. M. Shara
Affiliation:
Department of Astrophysics, American Museum of Natural History, New York, USA
D. R. Zurek
Affiliation:
Department of Astrophysics, American Museum of Natural History, New York, USA
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Abstract

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We report on XMM-Newton and Chandra observations of the globular cluster NGC 2808. We detect one quiescent low mass X-ray binary of the 3±1 expected, if these systems are formed through encounters, and we show evidence for the presence of 20±10 bright cataclysmic variables in the core with a luminosity above 4×1031 erg s−1. We also review the specific nature of cataclysmic variables in globular clusters with reference to recent VLT/FORS1 observations of a cataclysmic variable in M 22.

Keywords

globular clusters: individual (NGC 2808, M 22)stars: neutroncataclysmic variablesbinaries: close
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S246: Dynamical Evolution of Dense Stellar Systems , September 2007 , pp. 373 - 374
Copyright
Copyright © International Astronomical Union 2008

References

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