A soft X-ray observation of Omega Centauri with EXOSAT

Details A soft X-ray observation of Omega Centauri with EXOSAT A soft X-ray observation of Omega Centauri with EXOSAT

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...168..169v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 168, no. 1-2, Nov. 1986, p. 169-172.

Astronomy and Astrophysics

Astronomy

11

Globular Clusters, Spaceborne Astronomy, Stellar Spectrophotometry, Variable Stars, X Ray Binaries, Exosat Satellite, Heao 2, Stellar Luminosity

Scientific paper

In an observation with the LE1 CMA detector of the EXOSAT observatory the authors have detected two of the X-ray sources previously discovered in the globular cluster ω Cen with the IPC detector on board of the Einstein satellite. They give improved positions for these two sources. On the basis of comparison of the EXOSAT and Einstein count rates it is concluded that these two sources in ω Cen are either very soft (kT ≡ 40eV) or highly variable. If they are very soft, previous estimates of their X-ray luminosity can be too high by an order of magnitude.

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