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New evidence on the nature of the neutron star and accretion flow in VELA X-1 from pulse timing observations

1984; IOP Publishing; Volume: 283; Linguagem: Inglês

10.1086/184332

1538-4357

P. E. Boynton, J. E. Deeter, F. K. Lamb, G. Zylstra, S. H. Pravdo, N. E. White, K. S. Wood, D. Yentis,

Astronomical Observations and Instrumentation

view Abstract Citations (75) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS New evidence on the nature of the neutron star and accretion flow in Vela-X-1 from pulse timing observations. Boynton, P. E. ; Deeter, J. E. ; Lamb, F. K. ; Zylstra, G. ; Pravdo, S. H. ; White, N. E. ; Wood, K. S. ; Yentis, D. J. Abstract It 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. Publication: The Astrophysical Journal Pub Date: August 1984 DOI: 10.1086/184332 Bibcode: 1984ApJ...283L..53B Keywords: Binary Stars; Neutron Stars; Stellar Mass Accretion; Stellar Oscillations; Stellar Rotation; X Ray Stars; Orbital Elements; Radiant Flux Density; Astrophysics full text sources ADS | data products SIMBAD (2)