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The evolutionary status of 4U 1820-30The evolution of an ultracompact binary wherein mass transfer is driven by the emission of gravitational radiation is calculated, emphasizing the systematic study of how the rate of change in orbital period depends on the various system parameters. Analytic scaling laws are derived describing how the mass of the secondary, the mass transfer rate, and the rate of change of period depend on the binary system parameters, and these simple relations are applied to the 4U 1820-30 system. Detailed numerical evolutionary calculations are performed utilizing Zapolsky-Salpeter (1969) models for cold stars, but allowing for the possibility that the secondary has not yet reached a completely degenerate configuration. The results are used to set significant constraints on the deviation from a completely degenerate configuration of the secondary, the systemic mass-loss parameters, and the mass of the neutron star in the 4U 1820-30 system.
Document ID
19880031873
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)
Ma, C. P.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Joss, P. C.
(MIT Cambridge, MA, United States)
Nelson, L. A.
(MIT, Cambridge, MA; Toronto, University Canada)
Date Acquired
August 13, 2013
Publication Date
November 15, 1987
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 322
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
88A19100
Funding Number(s)
CONTRACT_GRANT: NSF AST-84-19834
CONTRACT_GRANT: NGL-22-009-638
CONTRACT_GRANT: NSG-7643
Distribution Limits
Public
Copyright
Other

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