SWSextantis stars: the dominant population of CVs with orbital periods between 3–4hours

Abstract

We present time-series optical photometry of five new CVs identified by the Hamburg Quasar Survey. The deep eclipses observed in HS 0129+2933 ( = TT Tri), HS 0220+0603, and HS 0455+8315 provided very accurate orbital periods of 3.35129827(65), 3.58098501(34), and 3.56937674(26) h, respectively. HS 0855+3822 shows grazing eclipses and has a likely orbital period of 3.2169(2) h. Time-resolved optical spectroscopy of the new CVs (with the exception of HS 0855+3822) is also presented

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