The X-ray source in the core of 47 Tucanae

Details The X-ray source in the core of 47 Tucanae The X-ray source in the core of 47 Tucanae

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...214..113a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 214, no. 1-2, April 1989, p. 113-122.

Astronomy and Astrophysics

Astrophysics

39

Globular Clusters, Spectrum Analysis, X Ray Sources, X Ray Spectra, Astronomical Photometry, Cataclysmic Variables, Heao 2, Ubv Spectra, X Ray Binaries

Scientific paper

X-ray, CCD, and image tube optical observations have been obtained for the X-ray source in the core of 47 Tucanae. The X-ray spectrum of the source is best fit by thermal bremsstrahlung with kT = 2 keV. Transient period pulsations and rapid pulsations are found at periods of 120.200s and 4.580 s, respectively. A limiting magnitude U = 17 (Mu = 3.6) is derived for the source. The periodic pulsations suggest that the source is a cataclysmic variable, but the X-ray luminosity and location in the core suggest a low mass X-ray binary. A high angular resolution search for an optical counterpart to the source is recommended.

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