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Uhuru observations of 4U 1608-52 - The 'steady' X-ray source associated with the X-ray burst source in NormaData 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.
Document ID
19770028845
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Tananbaum, H.
(Harvard Coll. Observatory Cambridge, MA, United States)
Chaisson, L. J.
(Harvard Coll. Observatory Cambridge, MA, United States)
Forman, W.
(Harvard Coll. Observatory Cambridge, MA, United States)
Jones, C.
(Harvard College Observatory and Smithsonian Astrophysical Observatory Cambridge, Mass., United States)
Matilsky, T. A.
(MIT Cambridge, Mass., United States)
Date Acquired
August 8, 2013
Publication Date
November 1, 1976
Publication Information
Publication: Astrophysical Journal
Volume: 209
Subject Category
Astronomy
Accession Number
77A11697
Funding Number(s)
CONTRACT_GRANT: NAS5-20048
Distribution Limits
Public
Copyright
Other

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