Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...397..961r&link_type=abstract
Astronomy and Astrophysics, v.397, p.961-967 (2003)
Astronomy and Astrophysics
Astrophysics
4
Stars: Novae, Cataclysmic Variables, Stars: Dwarf Novae, Stars Individual: Wx Cet, Stars Individual: Wz Sge, Accretion, Accretion Disks
Scientific paper
We analyse time-resolved spectroscopy of WX Cet, a dwarf nova of the WZ Sge class, by means of a dynamical model based on the measured K_1 and using the superhump period excess epsilon to constrain the mass ratio q of this CB. From time resolved spectroscopy of Thorstensen et al. we determine orbital amplitude K_1 and separation 2V_d of the disk emission lines as well as the S-wave amplitude A_s and relative phase alpha of the hot spot. Our dynamical analysis, following Smak's inclination independent solution for WZ Sge, yields rather high q, hardly compatible with the superhump resonance condition within the accretion disc. Rejecting K_1 as affected by tidal and/or stream effects, we follow Patterson and determine q=0.085 from q-epsilon relation based on superhump dynamics. In this way we obtain likely masses of the components M_1 = 0.55+/-0.15 Msun and M_2 = 0.047+/-0.013 Msun. From this result we argue that despite similarities to WZ Sge, WX Cet with its relatively massive secondary represents an earlier stage of mass transfer in a cataclysmic binary than WZ Sge.
Rogoziecki Piotr
Schwarzenberg-Czerny Aleksander
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