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Evidence for the binary nature of A0535+26The transient X-ray source A0535+26 was observed extensively with the SAS-3 satellite on two occasions. Sufficient timing data on the 104-s periodicity were obtained to indicate that the pulse period was changing during both of the observations. The possibility that these period changes are intrinsic to the compact star (e.g., due to accretion torques) cannot be completely excluded. However, it is demonstrated that all of the SAS-3 timing data can be explained by orbital motion of the X-ray star about a companion. Constraints are then placed on the orbital elements of the system. The results indicate a model for this source that consists of a neutron star in a long-period orbit (period of at least 17 days) about an OB star with a variable stellar wind.
Document ID
19760061522
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Rappaport, S.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Bradt, H.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Clark, G. W.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Jernigan, J. G.
(MIT Cambridge, Mass., United States)
Joss, P. C.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Date Acquired
August 8, 2013
Publication Date
September 15, 1976
Publication Information
Publication: Astrophysical Journal
Volume: 208
Subject Category
Astrophysics
Accession Number
76A44488
Funding Number(s)
CONTRACT_GRANT: NAS5-11450
Distribution Limits
Public
Copyright
Other

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