Spectroscopy of the dwarf nova CG Draconis.

Details Spectroscopy of the dwarf nova CG Draconis. Spectroscopy of the dwarf nova CG Draconis.

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...325..601b&link_type=abstract

Astronomy and Astrophysics, v.325, p.601-608

Astronomy and Astrophysics

Astrophysics

3

Stars: Binaries: Close, Stars: Novae, Cataclysmic Variables, Stars: Individual: Cg Dra

Scientific paper

We present spectroscopic observations of the dwarf nova CG Dra which exhibits a two component spectrum. Absorption lines stand out clearly and can be classified as belonging to spectral type K5 +/- 2. The wavelength dependent veiling fraction could be determined. The emission spectrum is not untypical for a dwarf nova but shows some peculiarities in the helium lines. Radial velocity measurements indicate a period of either 4^h^32^m^ or 5^h^37^m^, too short for the absorption line spectrum if interpreted within the canonical CV model. Worse, the absorption line radial velocity amplitude is approximately a factor 30 less than that for the Balmer lines and in phase with them. This cannot easily be explained in the framework of standard CV models. However, it cannot be excluded that the RV variations of the absorption lines are accidental and that the corresponding star is not a component of the cataclysmic variable.

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