Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...209l.125t&link_type=abstract
Astrophysical Journal, vol. 209, Nov. 1, 1976, pt. 2, p. L125-L130.
Astronomy and Astrophysics
Astronomy
27
Globular Clusters, Light Curve, Uhuru Satellite, X Ray Sources, Spaceborne Astronomy, X Ray Astronomy, X Ray Spectra
Scientific paper
Data are presented for the X-ray source 4U 1608-52, summarizing its light curve, location, and spectral parameters. Evidence is presented showing that this source is the 'steady' X-ray counterpart of the X-ray burst source in Norma. The spectrum of the 'steady' source is compared with the spectrum observed during two bursts, and it is noted that there is substantially more low-energy absorption during the bursts. The 'steady' source spectral data are used to examine the optical data, and it is concluded that if the X-ray spectrum is thermal, then a globular-cluster counterpart probably would have been detected (whereas none has been). Further X-ray and optical observations are suggested for this source, since an optical identification may be central in determining whether all X-ray bursts have a common origin and if this origin requires a globular-cluster environment.
Chaisson L. J.
Forman William
Jones Christine
Matilsky Terry A.
Tananbaum Harvey
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