Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240..975e&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Oct. 15, 1989, p. 975-990. Research supported by C
Astronomy and Astrophysics
Astronomy
18
Accretion Disks, Cygnus Constellation, Dwarf Novae, Red Dwarf Stars, Stellar Spectra, Emission Spectra, H Beta Line, H Gamma Line, Line Spectra, Radial Velocity
Scientific paper
The high dispersion time-resolved spectroscopy obtained at the end of an outburst from the dwarf nova SS Cygni presents a double-peaked profile whose peak-to-peak separation is 526 + or - 14 km/sec. The lines have a complex structure which encompasses a narrow, asymmetric component generated by a hot spot in the accretion disk, or by the chromosphere of the red dwarf. Recently discovered light modulations in the optical and UV suggest the inclination angle to be of the order of 50 deg; if so, the secondary's mass and spectral type will be 0.4 solar masses and M1V, respectively. It is suggested that a heating effect on the secondary by the white dwarf and accretion disk may be the reason for this discrepancy in spectral type.
Costero Rafael
Diego Francisco
Echevarria J. J.
Enriquez Rogerio
Gutiérrez Leonel
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