Table 5: Sine fits to the ${\rm H\alpha }$ radial velocities of HS 1016, HS,1340, and HS 1857. For HS 2214 a combination of ${\rm H\alpha }$ and ${\rm H\beta }$ radial velocities were fitted, as the September 2000 Calar Alto spectra did not cover ${\rm H\alpha }$. For HS 1857 and HS 2214, the periods were fixed to their values determined from the photometry.

Object		 $T_{\rm0}$ Period (days) K ( ${\rm km~s^{-1}}$) $\gamma$ ( ${\rm km~s^{-1}}$)

HS 1016+3412		 $2452737.4039\pm0.0012$ $0.0794\pm0.0019$ $93.0\pm5.3$ $35.6\pm3.9$
HS 1340+1524 $2452737.4438\pm0.0018$ $0.06435\pm0.00012$ $57.5\pm6.2$ $-31.1\pm4.1$
HS 1857+7127 $2452368.53243\pm0.00098$ $0.189109\pm0.000001$ $128.0\pm9.6$ $-17.9\pm7.4$
HS 2214+2845 $2451812.3309\pm0.0028$ $0.17918\pm0.00039$ $73.5\pm6.5$ $29.8\pm5.0$

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