SIMBAD references

2001ApJ...562..363H - Astrophys. J., 562, 363-367 (2001/November-3)

Identification of the low-mass X-ray binary and faint X-ray sources in NGC 6652.

HEINKE C.O., EDMONDS P.D. and GRINDLAY J.E.

Abstract (from CDS):

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 (MV∼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 MV∼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 NH=5.5x1020, source A has intrinsic luminosity LX∼5.3x1035 ergs.s–1. Assuming a 1 keV thermal bremsstrahlung spectrum, B has LX∼4.1x1033 ergs.s–1, while C and D have LX∼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.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: Close - Stars: Binaries: Eclipsing - globular clusters: individual (NGC 6652) - Stars: Novae, Cataclysmic Variables - Stars: Neutron - Stellar Dynamics - X-Rays: Binaries

Nomenclature: Table 1: [HEG2001] A (Nos A-D) = CXOGlb JHHMMSS.s+DDMMSS N=4.

Simbad objects: 12

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