... period

Based on observations carried out at the Swiss Euler Telescope at ESO, La Silla, Chile.

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... RX J1603.9-3938

During the writing of this paper we learned that Guenther et al. (2001) independently derived an orbital solution for this system.

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... ZAMS

A preliminary analysis of the composite spectra of RX J1301.0-7654a gives a $\log L/L_\odot \sim 0.1$ for both components. A detailed analysis will be presented in Covino et al. (2001b).

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