2001ApJ...562..363H

We have detected three new X-ray point sources, in addition to the known low-mass X-ray binary (LMXB) X1832-330, in the globular cluster NGC 6652 with a Chandra 1.6 ks HRC-I exposure. Star 49 (M_V∼4.7), suggested by Deutsch and coworkers as the optical candidate for the LMXB, is identified (<0".3) not with the LMXB, but with another, newly detected source (B). Using archival Hubble Space Telescope (HST) images, we identify (<0".3) the LMXB (A) and one of the remaining new sources (C) with blue variable optical counterparts at M_V∼3.7 and 5.3, respectively. The other new source (D) remains unidentified in the crowded cluster core. In the 0.5-2.5 keV range, assuming a 5 keV thermal bremsstrahlung spectrum and N_H=5.5x10²⁰, source A has intrinsic luminosity L_X∼5.3x10³⁵ ergs.s^–1. Assuming a 1 keV thermal bremsstrahlung spectrum, B has L_X∼4.1x10³³ ergs.s^–1, while C and D have L_X∼8x10³² ergs.s^–1. Source B is probably a quiescent LMXB, while source C may be either a luminous cataclysmic variable or a quiescent LMXB.