Discovery of an obscured globular cluster associated with GX 354+0 /=4U/MXB 1728-34/

Details Discovery of an obscured globular cluster associated with GX 354+0 /=4U/MXB 1728-34/ Discovery of an obscured globular cluster associated with GX 354+0 /=4U/MXB 1728-34/

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247l..17g&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 247, July 1, 1981, p. L17-L21.

Astronomy and Astrophysics

Astronomy

47

Globular Clusters, Heao 2, Infrared Astronomy, Signal To Noise Ratios, Stellar Spectrophotometry, X Ray Sources, Flare Stars, Interstellar Extinction, Metallic Stars, Star Distribution, Stellar Luminosity

Scientific paper

A diffuse infrared source identified as the most heavily obscured globular cluster yet found, was observed using the NASA 3m infrared telescope facility and Einstein positions for the X-ray source GX 354+0 (=4U/MXB 1728-34). Color excesses were measured to 1.4 + or - 0.3 for E(J-H) and 0.63 + or - 0.07 for E(H-K), and the visual extinction was determined at 10.6 + or - 1.3. The magnitude of several giant branch stars imply the cluster to be at a distance of 10.0 + or - 3.9 kpc, if metal rich, or 5.2 + or - 1.4 kpc, if metal poor. A single burst from MXB 1728-34 was observed with a blackbody temperature and cluster distance that indicated the luminosity to be not less than 10 times the Eddington limit for a neutron star model. This identification brings to 11 the number of compact X-ray sources in globular clusters, and reinforces the connection between GX sources, bursters, and globular clusters.

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