Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...327.1107b&link_type=abstract
Astronomy and Astrophysics, v.327, p.1107-1113 (1997)
Astronomy and Astrophysics
Astrophysics
8
Stars: Binaries: Close, Stars: Novae, Cataclysmic Variables, Stars: Individual: Dx And
Scientific paper
We present time-resolved spectra of the double-lined dwarf nova DX And in quiescence from two campaigns in 1989 and 1993. Using an unusual method, we have reconstructed the radial velocity amplitudes and phases of the absorption and emission line components from data suffering from serious wavelength calibration problems by measuring the relative motions of as well as the phase shift between the two line systems. We are thus able to refine the orbital period and to determine a long-term ephemeris. The relative contribution of the primary to the total light was measured as a function of wavelength, permitting to correct the absorption line spectrum for the veiling effect. The secondary star exhibits several spectral peculiarities: in addition to the enhanced Ca I absorption lines reported previously, we find several Cr I lines to be significantly stronger than in a comparison star of similar spectral type.
Bruch Albert
Hessman Frederic V.
Kochsiek Alexander
Schimpke Thomas
Vrielmann Sonja
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