Vela X-1 pulse timing. II - Variations in pulse frequency

The pulsed X-ray emission of Vela X-1 during May 1978 and December-January 1978-1979 is investigated analytically on the basis of published satellite observations. The data are compiled in tables and graphs and discussed in detail, with reference to data for the entire 1975-1982 period. Variations i...

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Veröffentlicht in:	Astrophys. J.; (United States) 1989-01, Vol.336 (1), p.376-393
Hauptverfasser:	Deeter, J. E., Boynton, P. E., Lamb, F. K., Zylstra, G.
Format:	Artikel
Sprache:	eng
Schlagworte:	640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources ANALYTICAL SOLUTION Astronomy Astrophysics BINARY STARS CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COSMIC RADIO SOURCES Earth, ocean, space ECLIPSE ELECTROMAGNETIC RADIATION Exact sciences and technology IONIZING RADIATIONS Late stages of stellar evolution (including black holes) MOTION NEUTRON STARS PULSARS PULSES RADIATIONS ROTATION STAR ACCRETION STAR EVOLUTION STARS VARIATIONS X RADIATION
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Beschreibung
Zusammenfassung:	The pulsed X-ray emission of Vela X-1 during May 1978 and December-January 1978-1979 is investigated analytically on the basis of published satellite observations. The data are compiled in tables and graphs and discussed in detail, with reference to data for the entire 1975-1982 period. Variations in pulse frequency are identified on time scales from 2 to 2600 days; the lower nine octaves are characterized as white noise (or random walk in pulse frequency), while the longer-period variations are attributed to changes in neutron-star rotation rates.
ISSN:	0004-637X 1538-4357
DOI:	10.1086/167017