Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..151v&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)151-(12)160
Astronomy and Astrophysics
Astronomy
13
Globular Clusters, Light Curve, Luminosity, Sky Surveys (Astronomy), X Ray Astronomy, X Ray Binaries, Heao 1, Heao 2, Proportional Counters, Rosat Mission, Uhuru Satellite, X Ray Telescopes
Scientific paper
We review the first observations of globular clusters obtained with the X-ray telescope on board of the ROSAT satellite. In the All-Sky Survey, all known bright sources and two new transient sources were detected. In addition a super-soft source was found in NGC5272. Concerning the dim sources, the survey suggests that those outside the core of omega Cen are not related to the cluster. The survey further improved by one or two magnitudes on many upper limits previously obtained by the HEAO-1 satellite. Pointed observations have improved the positional accuracy of a number of sources and added to the number of known dim sources. In 47 Tuc, the known central source is resolved into 4 separate sources, which we argue are all soft X-ray transients. A comparison with observations of the old open cluster M67 leads us to suggest that some of the dim sources may be conglomerates of a large number of RS Can Ven type binaries.
Bunk Wolfram
Hasinger Guenter
Johnston Helen M.
Verbunt Frank
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