Open AccessThe distances to the X‐ray binaries LSI +61° 303 and A0535+262
Author(s) -
I. A. Steele,
I. Negueruela,
M. J. Coe,
P. Roche
Publication year - 1998
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.1998.01593.x
Subject(s) - physics , astrophysics , binary number , spectral line , stellar classification , astronomy , arithmetic , mathematics
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.