Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...177...91j&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 177, no. 1-2, May 1987, p. 91-100. Research supported by the Ministere de l'Ed
Astronomy and Astrophysics
Astrophysics
33
B Stars, Infrared Spectra, Stellar Mass Accretion, Stellar Spectrophotometry, Visible Spectrum, X Ray Sources, Milky Way Galaxy, Orbital Elements, Radial Velocity, Stellar Envelopes, Stellar Magnitude, Temporal Resolution
Scientific paper
The authors present new photometric (optical and infrared) and spectroscopic observations of the Be star HDE 245770, the optical counterpart of the transient X-ray source A 0535+26. They derive a B0 III spectral type, slightly different from previous determinations, which places HDE 245770 at a distance d = 2.6±0.4 kpc, inside the Perseus arm of the Galaxy. The authors use their radial velocity measurements together with published data (Hutchings et al., 1978) and a recently proposed X-ray orbital solution (Sato, 1985) to constrain the geometry of the binary system. They assume a classical Be envelope of low expansion velocity and discuss the possible densities, velocity laws and structures of the envelope compatible with the observed IR excess and X-ray flux at periastron and apoastron.
Janot-Pacheco Eduardo
Motch Ch.
Mouchet Martine
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