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Title:
Observations of a bright, variable X-ray source in a globular cluster
Authors:
Canizares, C. R.; Neighbours, J. E.
Affiliation:
AA(MIT, Cambridge, Mass.), AB(MIT, Cambridge, Mass.)
Publication:
Astrophysical Journal, vol. 199, July 15, 1975, pt. 2, p. L97-L99. (ApJL Homepage)
Publication Date:
07/1975
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
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
DOI:
10.1086/181857
Bibliographic Code:
1975ApJ...199L..97C

Abstract

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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