Coordinated X-ray, ultraviolet, optical, and infrared observations of the transient source A0535+26

Astronomy and Astrophysics – Astronomy

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Infrared Astronomy, Optical Emission Spectroscopy, Stellar Spectra, Ultraviolet Spectroscopy, X Ray Sources, Absorption Spectra, Iue, Stellar Mass Ejection

Scientific paper

Data of A 0535+26/HDE 245770 from IR, optical, UV and X wavelengths before and after one of the strongest X-ray outbursts, expected on the basis of the 111-day periodicity of this source and detected by the ASTRON satellite on February 1, 1984 are presented. The IUE observations performed on Nov 10, 1983 and Jan 23, 1984 are entirely compatible with earlier measurements. Optical spectra taken immediately before the X-ray outburst show H gamma in absorption and H alpha in weakened emission. In September and in January 1984 before the X-ray outburst the star presents diminished IR excess. Mass loss is discussed.

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