Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....94l..29v&link_type=abstract
Astronomy and Astrophysics, Vol. 94, P. L29, 1981
Astronomy and Astrophysics
Astrophysics
48
Scientific paper
Eighteen eclipse light curves of OY Car in quiescent state and one during early rise to an outburst are analysed. They show totality phases for primary (white dwarf and/or central part of the disc) and hot spot. A very precise orbital period of 0.0631209247 d could be derived from the eclipses of the primary. An analysis of the eclipse geometry revealed the basic physical parameters of OY Car, in particular an orbital inclination i=79°±2° stellar Masses M1 = O.95±O.15 Msun and M2 = O.14±0.05 Msun, stellar radii, binary separation, as well as size and location of the hot spot. These results are compared to similar investigations on Z Cha, HT Cas and other ultra-short period dwarf novae, which all agree in relatively large primary masses (˜ 1 Msun). Therefore, the well-known period gap between 2 and 3h is not due to a discontinuity in the mass function of white dwarfs The hot spot location in quiescent state undergoes certain variations due to changes in the orientation of the gas stream, while the radius of the disc remains essentially constant.
Krzeminski Wojciech
Pedersen Holger
Schoembs R.
Vogt Nicolas
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