Based in part on observations obtained at the German-Spanish Astronomical Center, Calar Alto, operated by the Max-Planck-Institut für Astronomie, Heidelberg, jointly with the Spanish National Commission for Astronomy; on observations made with the IAC80 and OGS telescopes, operated on the island of Tenerife by the Instituto de Astrofísica de Canarias (IAC) and the European Space Agency (ESA), respectively, in the Spanish Observatorio del Teide of the IAC; on observations made at the 1.2 m telescope, located at Kryoneri Korinthias, and owned by the National Observatory of Athens, Greece; and on observations made with the William Herschel Telescope, which is operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the IAC.

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IRAF is distributed by the National Optical Astronomy Observatories, which is operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation.

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... quiescence

Shafter et al. (1984) suggested the detection of the heated secondary during quiescence in IR Com ( $P_{\rm orb}=98.5$ min) on the basis of a perturbation in the radial velocity curves of the emission lines. Secondary emission was also invoked in the eclipsing dwarf nova V893 Sco ( $\mbox{$P_{\rm orb}$ }=109.4$ min; Matsumoto et al. 2000) based on its ${\rm H\alpha }$ Doppler tomogram, but V893 Sco has never undergone a superoutburst. The most reliable detection seems to have been made in the long-period SU UMa star TU Men ( $\mbox{$P_{\rm orb}$ }=168.8$ min), whose ${\rm H\alpha }$ trailed spectra seem to show a narrow emission moving with the phasing of the secondary (Tappert et al. 2003), but its velocity semi-amplitude is almost the same as the double peak semi-separation so one must be cautious when interpreting their results.

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