Spectroscopic confirmation of high galactic latitude cataclysmic variables

Astronomy and Astrophysics – Astrophysics

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Cataclysmic Variables, Dwarf Novae, Stellar Spectra, Stellar Spectrophotometry, M Stars, Spectral Line Width, Stellar Luminosity, Stellar Mass Accretion

Scientific paper

Low/medium resolution spectra of 22 potential high galactic latitude cataclysmic variables and three interesting systems in the galactic plane are presented in order to confirm their close binary nature, to determine the emission line contribution from the disk and the spectral type of the secondary star from any observed absorption line features. The secondary is identified in VZ Aqr, V630 Cas and CW 1045 + 525, while AK Cnc shows a red continuum longward of 6500 A. EG Aqr, V360 Her, and possibly PG 2240 + 193, do not have spectra that indicate cataclysmic variables. When the distances are derived for the high galactic latitude systems with known secondaries from this study and the literature, the absolute magnitudes for three systems are several magnitudes lower than for objects in the plane of the galaxy. These low magnitudes are present in systems with large outburst amplitudes.

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