Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...465..951v&link_type=abstract
Astrophysical Journal v.465, p.951
Astronomy and Astrophysics
Astronomy
5
Stars: Novae, Cataclysmic Variables, Stars: Individual Constellation Name: Tv Columbae, Ultraviolet: Stars, X-Rays: Stars
Scientific paper
The intermediate polar TV Columbae was observed for 8640s with the ROSAT PSPC. The best-fitting model to the 0.1-2.0 keV spectrum combines a power law with photon index α = 0.82 and a 54 eV blackbody, both observed through a column density of 4.6 x 1020 cm-2. No evidence is seen for line emission from the Fe L-shell complex. We observe an X-ray/optical flux ratio of 0.2: our measured X-ray photon flux is not sufficient to produce the He II λ1640 recombination line flux found by lUE. Some of the missing X-ray flux can be attributed to absorption in an accretion curtain. An additional very soft EUV component (e.g., a 20 eV blackbody) could provide sufficient photons in the 55-100 eV band to account for most of the He ii luminosity while remaining hidden to the PSPC and lUE. A second possibility is that the X-ray flux is indeed small and collisional excitation accounts for 80% of the He II λ1640 flux. Because of instrumental difficulties, we are unable to confirm the 32 minute period observed with EXOSAT and attributed to rotation of the white dwarf.
Primini Frank
Raymond John C.
Silber Andrew
Vrtilek Saeqa D.
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