Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342..493c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 1, 1989, p. 493-515.
Astronomy and Astrophysics
Astrophysics
18
Dwarf Novae, Ultraviolet Spectroscopy, Visible Spectrum, X Ray Binaries, X Ray Spectroscopy, Astronomical Photometry, Exosat Satellite, Iue, Light Curve
Scientific paper
An extensive set of quasi-simultaneous, multiwavelength observations of the intermediate polar FO Aqr (H2215-086) obtained in 1983-1985 with the Exosat and IUE satellites and from La Palma Observatory are presented. The rotational 21 minute period and sideband periods due to beating with the orbital modulation are observed in the optical band and in X-rays. In particular, it is noticeable that an unusual sideband frequency at Omega(rot) + 2 Omega(orb) is present in X-rays. Variability of the spectrum with the rotation period is detected, which can be interpreted as modulation by an absorbing envelope. A possible improvement to the current orbital ephemeris, based on photometric data, is also presented.
Belloni Tomaso
Bonnet-Bidaud Jean-Marc
Chiappetti Lucio
Corbet Robin H. D.
de Martino Domitilla
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