Quiescent observations of the WZ Sge type dwarf nova PQ Andromedae

Abstract

We have obtained time series optical spectra of the cataclysmic variable PQ And in quiescence. The spectra show a white dwarf continuum with narrow Balmer emission superimposed over strong Balmer absorption. The emission lines have blue and red components whose strength changes with time. An analysis of the H$\alpha$ emission line implies a short orbital period below the period gap. Given its lack of accretion disk features, its large and infrequent outbursts, and an orbital period below the period gap, PQ And is probably a low accretion rate object similar to WZ Sge. In addition, white dwarf model fits imply that PQ And is an excellent ZZ Cet candidate.

arXiv commentAASTeX. 8 pages, 6 figures, 3 tables. Accepted to the PASP

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• Spectroscopic properties of the dwarf nova-type cataclysmic variables observed by LAMOST
• The Dwarf Nova PQ Andromedae
• R-mode oscillations in accreting white dwarfs in cataclysmic variables
• Discovery of Non-radial pulsations in PQ Andromedae
• Spectroscopic and Photometric Observations of Dwarf Nova Superoutbursts by the 3.8 m Telescope Seimei and the Variable Star Network
• Detectability of continuous gravitational waves from planetary-mass companions orbiting compact stars