Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86..871h&link_type=abstract
Astronomical Journal, vol. 86, June 1981, p. 871-874.
Astronomy and Astrophysics
Astronomy
20
Pulsars, Supergiant Stars, Supernova Remnants, X Ray Sources, Astronomical Photography, B Stars, Binary Stars, High Resolution
Scientific paper
High resolution Imager X-ray pictures from the Einstein Observatory identify the two pulsars optically with Hen 715 and a 12m reddened B1 supergiant, respectively. Optical spectroscopic data are discussed for each object. Hen 715 is a main-sequence B0 star whose properties are consistent with the 188-day X-ray binary period proposed by Watson et al. (1981). However, no optical periodicity is evident. The reddened B star is also likely to have the long binary period implied by X-ray pulse timing. Pulse arrival times are given for each object, and distance and LX/L sub opt values are discussed. Optical nebulosity is seen in the position of extended X-ray luminosity in the region, reported by Lamb et al. (1980).
Cowley Anne Pyne
Crampton David
Hutchings John B.
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