Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.273..863s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 273, Issue 4, pp. 863-876.
Astronomy and Astrophysics
Astronomy
22
Accretion, Accretion Discs, Binaries: Eclipsing, Binaries: Spectroscopic, Stars: Individual: Px And, Novae, Cataclysmic Variables
Scientific paper
We present time-resolved spectroscopy of the nova-like variable PX And in both high and low accretion states. In common with many other nova-like objects, it displays single-peaked emission lines incompatible with an accretion disc origin. Continuum emission displays a shallow eclipse but high-excitation line emission remains uneclipsed, suggesting an origin close to the white dwarf. Balmer and HeI lines undergo core absorption at times centred on orbital phase 0.5, and contain maximum flux at phase 0.8. We show that the high-excitation emission shares a common velocity with the white dwarf, but we cannot predict the low-excitation line distributions without an accurate position-velocity relation. We discuss some likely models for this system and constrain the height above the disc at which emission must originate to remain uneclipsed.
Dhillon Vik S.
Jones H. P. D.
Still Martin D.
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