... expected[*]
Figure 1 and Tables 2, 3 are only available in electronic form at http://www.edpsciences.org
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...IRAF[*]
IRAF is distributed by the National Optical Astronomy Observatories.
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... star[*]
Using LHS399 from Sandy Leggett's library of M-dwarf spectra, http://ftp.jach.hawaii.edu/ukirt/skl/dM.spectra/
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...$\mbox{$P_{\rm orb}$ }>3.5$ h[*]
Ritter & Kolb (2003) list five U  Gem-type dwarf novae with $\mbox{$P_{\rm orb}$ }<3$ h: CC Cnc is a SU  UMa-type dwarf nova (Kato & Nogami 1997), and we included 587 Lyr, CF Gru, V544 Her, and FS Aur as dwarf novae with no subtype (XX) due to the lack of clear observational evidence for a specific subtype.
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... range[*]
A note of caution among the WZ Sge stars, which mostly have ultrashort-periods, concerns UZ Boo. Ritter & Kolb (2003) list a period of $\sim$3 h based on quiescent photometry, which is almost certainly wrong. Intensive time-series of the 2003 outburst of UZ Boo revealed a superhump period of 89.3 min (Kato, vsnet-campaign-dn 4064), and we use here this value as an estimate of the orbital period.
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... polar[*]
Excluding the double-degenerate helium CVs, which follow a different evolution channel that is not taken into account in the population models of de Kool (1992) and Politano (1996).
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Copyright ESO 2006