Open AccessS193: another non‐eclipsing SW Sex star
Author(s) -
MartínezPais I. G.,
RodríguezGil P.,
Casares J.
Publication year - 1999
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.1999.02483.x
Subject(s) - physics , balmer series , astrophysics , orbital period , cataclysmic variable star , stars , emission spectrum , variable star , line (geometry) , astronomy , radial velocity , spectral line , orbital inclination , spectroscopy , orbital speed , white dwarf , geometry , mathematics , arithmetic , binary number
We present time‐resolved optical spectroscopy of the cataclysmic variable S193. The emission lines are remarkably similar to those of V795 Her and exhibit high‐velocity S‐waves and complex absorptions that are modulated with the orbital period. Evidence for transient anomalous spectral features is seen during the first two nights of our run. We propose that S193 and V795 Her are non‐eclipsing SW Sex stars. Finally, we show that the `disc overflow' model fails to explain the Balmer line orbital behaviour in these low‐inclination systems.