Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.6504h&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #65.04; Bulletin of the American Astronomical Society, Vol. 25, p.1391
Astronomy and Astrophysics
Astronomy
Scientific paper
Observations of Hα and He I lambda lambda 5876,6678 in the cataclysmic variable V795 Her are presented; these emission lines are modulated with period 2.6 hours, in agreement with the ephemeris of Shafter et al. 1990. The Hα profile is double-peaked with peak-to-peak separation of ~ 900 km s(-1) . A strong S-wave threads between the peaks in the profile. A second S-wave with semi-amplitude of ~ 1500 km s(-1) is apparent. Tomography of Hα shows a prominent bright spot associated with the inner S-wave. The He I tomogram shows a crescent-shaped emission structure displaced from the Hα bright spot in phase. Models motivated by the observations are discussed. The S-wave emission may arise in magnetically channeled accretion onto the white dwarf, in which case the system is a DQ Her star. If the photometric period indicates the orbital period of the binary, then the white dwarf is rotating close to synchronism, and V795 Her may share some characteristics with the AM Her stars.
Haswell Carole A.
Horne Keith
Thomas GS
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