Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.273..742b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 273, Issue 3, pp. 742-750.
Astronomy and Astrophysics
Astronomy
18
Binaries: Close, Stars: Individual: Qq Vul, Stars: Magnetic Fields, Novae, Cataclysmic Variables, Stars: Rotation, X-Rays: Stars
Scientific paper
We report observations made in 1991 April of QQ Vul using the ROSAT and Ginga satellites. We find a spectral variation in soft X-rays that can be accounted for by an increase in the blackbody temperature by 3-5 eV, or by an increase in the intrinsic absorbing column density of (1.8-3.6)x10^19 cm^-2, between phases 0.5 and 1.0. Together with evidence for separated hard and soft X-ray emission regions, this suggests the presence of two-pole accretion. The emission region furthest from the secondary has a soft X-ray excess >~2.5, suggesting buried shocks arising from the accretion of dense filaments. The other emission region, closer to the secondary, is the site of the hard X-ray component. The hard X-ray data show a 6.7-keV iron K line of large equivalent width.
Baluta Christopher
Beardmore Andrew P.
Mason Keith O.
Nousek John A.
Osborne Julian Paul
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