Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..459g&link_type=abstract
In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 459-46
Astronomy and Astrophysics
Astrophysics
7
Astronomical Spectroscopy, Beryllium, Stellar Spectra, X Ray Binaries, Bursts, Optical Emission Spectroscopy, Ultraviolet Spectroscopy, X Ray Spectroscopy
Scientific paper
The X-ray/Be transient system A 0535+26/HDE 245770 was monitored in X-ray, UV, and optical wavelengths to study the lighting of X-ray outbursts. The X-ray observations were carried out with ASTRON satellite on April 19, 1985 and March 17, 1986, dates of expected X-ray outbursts as predicted by the 111 day orbital periodicity. The measured fluxes are 6.5 mCrab and less than 5 mCrab in April 1985 and March 1986, respectively. The IUE observations were performed on January 29, and on March 13 and 15, 1986, predicted periods of quiescence and a bit earlier than an outburst, respectively. Optical spectroscopic observations were performed too. The absence of two X-ray expected outbursts implies either an inaccuracy of 111 day period or a temporary turning-off of the source.
Bartolini Corrado
Burger Marc
de Loore Camiel
Giovannelli Franco
Golynskaya I. M.
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