Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216..811m&link_type=abstract
Astrophysical Journal, Part 1, vol. 216, Sept. 15, 1977, p. 811-813, 815-818. ERDA-supported research
Astronomy and Astrophysics
Astrophysics
29
B Stars, Binary Stars, Spectrophotometry, Star Distribution, X Ray Sources, Continuous Spectra, Emission Spectra, Flux Density, Pulsars, Stellar Luminosity, Stellar Radiation, X Ray Stars
Scientific paper
Results are reported for spectrophotometric and photometric observations of 11 candidate stars appearing within or just outside the Ariel 5 error box of the transient slow X-ray source A0535+26. The observations were performed over the spectral range from 3600 to 7000 A with 8-A resolution down to a limiting V magnitude of roughly 23. No star observed is found to show any trace of emission lines except for the bright Be star HDE 245770; this star is taken as the best candidate for the optical counterpart of the X-ray source. A spectral type slightly earlier than B0 is suggested for this star, its (B-V) color excess is estimated as approximately 0.8, and a rather wide range of distances is derived. The companion star's ratio of X-ray to bolometric luminosity is determined to be at least about 0.1 at the time of X-ray maximum. A formalism is outlined for evaluating the observable effects of pulsed X-ray heating of the companion star.
Bowyer Stuart
Chanan Greg
Margon Bruce
Nelson Jeffrey
Thorstensen John R.
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