Journal Article

The distances to the X-ray binaries LSI +61° 303 and A0535+262

I. A. Steele, I. Negueruela, M. J. Coe and P. Roche

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 297, issue 1, pages L5-L10
Published in print June 1998 | ISSN: 0035-8711
Published online June 1998 | e-ISSN: 1365-2966 | DOI:
The distances to the X-ray binaries LSI +61° 303 and A0535+262

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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.

Keywords: binaries: close; stars: emission-line; Be; stars: individual: LSI +61° 303; stars: individual: A0535+262; X-rays: stars

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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