Observations of SMC X-1 with the monitor proportional counter on the Einstein /HEAO 2/ X-ray Observatory - The pulse period and its history

Details Observations of SMC X-1 with the monitor proportional counter on the Einstein /HEAO 2/ X-ray Observatory - The pulse period and its history Observations of SMC X-1 with the monitor proportional counter on the Einstein /HEAO 2/ X-ray Observatory - The pulse period and its history

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..231d&link_type=abstract

Astrophysical Journal, Part 1, vol. 246, May 15, 1981, p. 231-237.

Astronomy and Astrophysics

Astronomy

14

Binary Stars, Neutron Stars, Proportional Counters, Spaceborne Astronomy, X Ray Sources, X Ray Stars, Heao 2, Pulse Duration, Secular Variations, Stellar Mass Accretion, Stellar Rotation

Scientific paper

The results of the sixth determination of the pulse period of the X-ray source SMC X-1 are presented. The observations were made in April 1979. The pulse period at this epoch was found to be (0.713683 + or - 0.000032) s referred to phase zero of the binary motion. This result together with all available historical data is utilized to quantify the observed trend toward spin-up. It is found that simple secular trends are not applicable. This finding is interpreted as evidence for additional variations in the pulse period. The obtained results are discussed in the context of present theoretical models for period variations in the binary pulsating X-ray sources. The apparent absence of spin-down episodes in the period history of SMC X-1 is also considered.

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