Spectroscopic and spectrophotometric studies of V2301 Oph. I. The high accretion state

Details Spectroscopic and spectrophotometric studies of V2301 Oph. I. The high accretion state Spectroscopic and spectrophotometric studies of V2301 Oph. I. The high accretion state

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...329..115s&link_type=abstract

Astronomy and Astrophysics, v.329, p.115-130 (1998)

Astronomy and Astrophysics

Astrophysics

12

Stars: Individual: V2301 Oph, Cataclysmic Variables, Eclipsing Binaries, Stars: Magnetic Fields

Scientific paper

An approach is made to clarify the two different classifications of V2301 Oph (formerly: 1H1752+081) as a low field intermediate polar or an AM Her candidate, by analysing phase-resolved spectroscopy and simultaneously recorded high-speed-spectrophotometry. By combining both data sets we obtained for the first time photometric data of V2301 Oph with high spectral (1.3 Angstroms) resolution during an enhanced accretion state. The trailed spectrograms show in unprecedented clearness the well-known complex emission line profiles which are characterized by a broad and a narrow component shifted in phase by Delta varphi ~ 0.25. By means of Doppler tomography the origin of the narrow component can be located on the irradiated face of the secondary star, whereas the broad component can be traced back to the coupling region where the accreting material is connected to the field lines. It was also possible to analyse separately the eclipse behaviour of the emission lines and of the respective continua. The decomposed continuum light curves clearly reveal that the pre-eclipse hump cannot be explained with a hot spot on an accretion disk. It can be rather assigned to cyclotron radiation from a shock-region on the white dwarf. Furthermore, it is shown from the eclipse features, that the acccretion stream is distorted due to a weak magnetic field. An investigation of the superimposed flickering did not reveal any short-periodic variation, which would be an evidence for a non-synchronously rotating primary star. Therefore, we can classify V2301 Oph as an AM Her system, where the dipole axis of the white dwarf is inclined to its rotational axis. Based on observations obtained at the German-Spanish Astronomical Center, Calar Alto, Spain.

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