The spectroscopic orbit of WRA 977 / = X-ray source 4U 1223-62/

Details The spectroscopic orbit of WRA 977 / = X-ray source 4U 1223-62/ The spectroscopic orbit of WRA 977 / = X-ray source 4U 1223-62/

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pasp...94..541h&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 94, June-July 1982, p. 541-547. NSF-supported research.

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7

Binary Stars, Stellar Motions, Stellar Spectra, Stellar Winds, Supergiant Stars, X Ray Sources, Orbital Elements, Pulsars, Radial Velocity

Scientific paper

Spectroscopic observations of the B1.5 supergiant Wra 977 from several observing seasons are described. The star has pronounced stellar wind characteristics which make orbital determination difficult. Lines which are considered most likely to represent orbital motions show velocities antiphased with the X-ray pulsar for the suggested 35.0-day period. A forced fit to the X-ray determined orbit yields a mass ratio of about 20 and implies masses of greater than 30 and greater than 1.5 solar masses for the stars. Weak He II 4686 A emission is detected. No evidence is found for profound periastron effects in the e = 0.44 orbit. Other spectroscopic information and the evolutionary status of the system are discussed. Similar considerations apply to the 41.37-day period.

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