AAS 201st Meeting, January, 2003
Session 129. LMXB's and Transient Sky
Oral, Thursday, January 9, 2003, 10:00-11:30am, 616-617

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[129.02] Chandra X-ray Studies of Globular Clusters: Quiescent LMXBs in Terzan 5 and M80

C. O. Heinke, J. E. Grindlay, P. D. Edmonds, D. A. Lloyd (Harvard University), H. N. Cohn, P. M. Lugger (Indiana University)

We present Chandra ACIS-I observations of the accreting binary populations in the rich globular clusters Terzan 5 and M80. We detect nine low-luminosity X-ray sources in Terzan 5 besides the known bright low-mass X-ray binary (LMXB), which entered a rare high state during the observation. Of these, four are likely quiescent LMXBs containing neutron stars, and five are probable cataclysmic variables (CVs), on the basis of X-ray colors, luminosities, and simple spectral fitting. We detect >16 faint X-ray sources in M80, of which two are probable quiescent LMXBs and most of the rest probable CVs. The identified probable quiescent LMXB population in globular clusters is now ~20, large enough to study their luminosity function and distribution within the Galactic globular cluster system, and for simple comparative spectral analysis. This work was supported in part by Chandra grant GO0-1034A.

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.