X-ray Binaries in the Ultrahigh Collision Rate Globular Cluster NGC 6388

Details X-ray Binaries in the Ultrahigh Collision Rate Globular Cluster NGC 6388 X-ray Binaries in the Ultrahigh Collision Rate Globular Cluster NGC 6388

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915302m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #153.02

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on the final results of a joint Chandra/HST study of the X-ray binary population in the massive, high-density globular cluster NGC 6388. NGC 6388 has the highest predicted X-ray binary production rate of any Galactic cluster and, indeed, we detected a large population of 61 Chandra sources within the half-mass radius with Lx > 4 × 1030 ergs s-1. Based on the X-ray colors of these sources, four are suggestive of quiescent low-mass X-ray binaries and five are suggestive of cataclysmic variables. We have identified four blue, optically variable counterparts to X-ray sources, evidence that these are bright CVs. One showed variability of 2 magnitudes in V, indicative of a dwarf nova eruption. The optical magnitudes of these sources put them in the same class as CV1 in M15 and the brightest CVs in 47 Tuc.

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