The distances to the X-ray binaries LSI +61° 303 and A0535+262 |
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| Authors: | Steele Negueruela Coe & Roche |
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| Institution: | Astrophysics Research Institute, Liverpool John Moores University, Liverpool L3 3AF,;Department of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ,;Astronomy Centre, CPES, University of Sussex, Brighton BN1 9QJ |
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| Abstract: | Chevalier & Ilovaisky use Hipparcos data to show that the X-ray binary systems LSI+61° 303 and A0535+262 are a factor of 10 closer (i.e. d ∼ few hundred pc) than previously thought ( d ∼ kpc). We present high-quality CCD spectra of the systems, and conclude that the spectral types, reddening and absolute magnitudes of these objects are strongly inconsistent with the closer distances. We propose that the Hipparcos distances to these two systems are incorrect owing to their relatively faint optical magnitudes. |
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| Keywords: | binaries: close stars: emission-line Be stars: individual: LSI +61° 303 stars: individual: A0535+262 X-rays: stars |
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