Table 3: RV differences and estimates of companion masses. $\Delta $ RV gives half peak-to-peak differences of the observed RVs listed in Tables 1 and 2. For RV constant objects in this survey (upper part of the table), $\Delta $ RV  is an upper limit for the RV semiamplitude of hypothetical companions missed due to RV precision. For them, the last column lists upper limits for the companion minimum mass $M_2 \sin i$derived by assuming a semimajor axis of 0.1 AU and circular orbits. For RV variable objects ( lower part of table), the recorded RV differences are lower limits for the RV amplitudes of hypothetical companions. For them, the last column gives a lower limit for the companion minimum mass $M_2 \sin i$for separations of 0.2 AU (Cha H$\alpha $ 8) and 0.4 AU (CHXR 74, Sz 23), resp. Primary masses are taken from Comerón et al. (1999, 2000).
Object $\Delta $ RV  $M_2 \sin i$
  [km s-1] [ $M_{\rm Jup}$]
RV constant:   max. $M_2 \sin i$
Cha H$\alpha $ 1 0.24 0.6
Cha H$\alpha $ 2 0.13 0.4
Cha H$\alpha $ 3 0.20 0.6
Cha H$\alpha $ 4 0.21 0.8
Cha H$\alpha $ 5 0.03 0.1
Cha H$\alpha $ 6 0.28 0.6
Cha H$\alpha $ 7 0.58 1.1
Cha H$\alpha $ 12 0.56 1.5
B 34 0.07 0.3
RV variable:   min. $M_2 \sin i$
Cha H$\alpha $ 8 1.37 6
CHXR 74 1.59 15
Sz 23 1.09 13


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