Other
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254....9o&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Jan. 1, 1992, p. 9-14.
Other
15
Astronomical Spectroscopy, Dwarf Novae, Emission Spectra, Stellar Spectra, Absorption Spectra, Balmer Series, Light Curve, Line Spectra, Radial Velocity
Scientific paper
The quiescent optical spectrum of the SU UMa-type dwarf nova TY PsA is characterized by broad, doubled emission lines. Cross-correlation radial velocities reveal a periodic modulation at the orbital period of 0.08414 d. This modulation could not be ascribed to variations in the line profile which appeared to be free of s-wave and other V/R variations. Instead, detailed investigation showed radial velocity variations in the entire line profile, indicating that the modulation was due to orbital motion. From previous observations during superoutburst of the broad, shallow absorption lines of TY PsA, no orbital radial velocity variations were detected. This result could be explained if TY PsA has an extreme mass ratio and an unusually low-mass secondary star. The orbital motion of the quiescent emission lines now rules out this explanation. Implications of the absence of orbital motion in the absorption lines are discussed but no model to explain their behavior could be found.
O'Donoghue Darragh
Soltynski M. G.
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