Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.257..476d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 257, no. 3, Aug. 1, 1992, p. 476-484. Research supporte
Astronomy and Astrophysics
Astronomy
55
Cataclysmic Variables, Fine Structure, Light Curve, Line Spectra, Radial Velocity, Stellar Atmospheres, Astronomical Maps, Binary Stars, Sodium, Stellar Mass, Stellar Models
Scientific paper
This paper shows how the relative strength of the Na I doublet over the surface of the secondary star can be calculated from radial velocity curves obtained using the Na I absorption feature around 8190 A. The results for 11 dwarf novae and one magnetic cataclysmic binary system are presented. For the five dwarf nova secondary stars that showed significant heating, it is found that the surface distribution is far more asymmetrical than would be expected from irradiation by the white dwarf and disk hotspot. A possible mechanism for this asymmetry is circulation currents induced by the heating of the half of the secondary star's atmosphere facing the disk hotspot. There is also found to be an asymmetrical surface distribution for AM Her which cannot be explained using this argument, since there is no disk in this magnetic system.
Davey Stephen
Smith Christopher R.
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