Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...328l..45o&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 328, May 15, 1988, p. L45-L50.
Astronomy and Astrophysics
Astrophysics
41
Magnetic Stars, Stellar Mass Accretion, White Dwarf Stars, X Ray Binaries, X Ray Sources, Exosat Satellite, Modulation, Stellar Luminosity
Scientific paper
The authors report the discovery of EXO 033319-2554.2, a soft X-ray source with 100% modulation of its soft X-ray flux, found during a systematic analysis of all of the EXOSAT soft X-ray data. The soft X-ray light curve, which has an on-off behavior, shows a period of 127.7±3.0 minutes. The bright part of the cycle lasts 0.55 in phase and is cut by an eclipse-like feature lasting 8 minutes. The optical counterpart has a magnitude of mv≈ 18.5. The characteristics of EXO 033319-2554.2 imply that it is an AM Her system. The companion star is probably responsible for the eclipse. Using the lengths of the bright phase and of the eclipse, the authors derive limits to the system geometry.
Angelini Leonardo
Giommi Paolo
Osborne Julian Paul
Stella Luigi
Tagliaferri Giampiero
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