Pulse profile and refined orbital elements for SMC X-1

Details Pulse profile and refined orbital elements for SMC X-1 Pulse profile and refined orbital elements for SMC X-1

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217..543p&link_type=abstract

Astrophysical Journal, Part 1, vol. 217, Oct. 15, 1977, p. 543-548.

Astronomy and Astrophysics

Astronomy

43

Binary Stars, Orbital Elements, Pulsars, X Ray Astronomy, X Ray Stars, Companion Stars, Eccentricity, Pulse Rate, Stellar Mass, Stellar Mass Accretion, Stellar Models

Scientific paper

Results of a reanalysis of SAS-3 data for SMC X-1, including greatly improved orbital elements, are presented. These elements, when combined with newly available data for the optical companion, Sk 160, yield improved estimates for the masses of SMC X-1 and Sk 160. A significant rate of change of intrinsic pulse period is detected during the course of the four-day observation which is consistent with the average value that was previously deduced from observations separated by 5 years. The X-ray pulse profile, averaged over one orbital cycle and with approximately 15-ms time resolution, is also presented. The pulse profile is found to be constant to within statistics, as a function of orbital phase. The implications of the small observed eccentricities of SMC X-1 and other binary X-ray pulsar systems are discussed.

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