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New evidence on the nature of the neutron star and accretion flow in Vela X-1 from pulse timing observationsIt is believed that variations in the intrinsic pulse frequencies of neutron star X-ray sources reflect changes in the rotation rate of the stellar crust produced by torque originating outside and inside the star. The external torque depends on the flow pattern of the accreting plasma, while the internal torque depends on the state of the interior and its coupling to the crust. Information about the accretion flow and the star itself can, therefore, be obtained on the basis of a study of intrinsic frequency variations. The present investigation is concerned with the results of a detailed study of the 283 s pulsing X-ray star Vela X-1 using pulse timing techniques. It is found that the frequency variations in this source are consistent with the occurrence of a succession of temporally unresolved events which can be characterized mathematically as second-order red noise in the pulse phase.
Document ID
19840065169
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Boynton, P. E.
(Washington Univ. Seattle, WA, United States)
Deeter, J. E.
(Washington, University Seattle, WA, United States)
Lamb, F. K.
(Washington Univ. Seattle, WA, United States)
Zylstra, G.
(Illinois, University Urbana, IL, United States)
Pravdo, S. H.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena CA, United States)
White, N. E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wood, K. S.
(Washington Univ. Seattle, WA, United States)
Yentis, D. J.
(U.S. Navy, Naval Research Laboratory, Washington DC, United States)
Date Acquired
August 12, 2013
Publication Date
August 15, 1984
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters to the Editor
Volume: 283
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
84A47956
Funding Number(s)
CONTRACT_GRANT: NSG-7653
CONTRACT_GRANT: NSF PHY-78-04404
CONTRACT_GRANT: NAS8-33360
CONTRACT_GRANT: NSF PHY-80-25605
CONTRACT_GRANT: NSF AST-82-16661
CONTRACT_GRANT: NSF AST-80-01471
Distribution Limits
Public
Copyright
Other

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