Observations of a bright, variable X-ray source in a globular cluster

Details Observations of a bright, variable X-ray source in a globular cluster Observations of a bright, variable X-ray source in a globular cluster

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...199l..97c&link_type=abstract

Astrophysical Journal, vol. 199, July 15, 1975, pt. 2, p. L97-L99.

Astronomy and Astrophysics

Astronomy

42

Black Holes (Astronomy), Globular Clusters, Neutron Stars, Stellar Radiation, Variable Stars, X Ray Sources, Binary Stars, Emission Spectra, Galactic Radiation, Radiant Flux Density, X Ray Stars

Scientific paper

The source 3U 1820-30 in NGC 6624 has been observed with the OSO-7 satellite. It shows variability of up to a factor of 5 in intensity over days and months and of a factor of 2 in about 5-10 minutes, but there are no evident periodicities. The luminosity of the source is 10 to the 38th ergs per sec (1-10 keV). Arguments are examined which suggest that mass accretion onto a neutron star or black hole provides the most likely mechanism of X-ray production.

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