All Tables

Table 1: RVs for BDs and VLMSs (M6-M8) in Cha I. Given are the date of the observation, heliocentric Julian day (HJD) at the middle of the exposure, the measured RV and the estimated error $\sigma _{{\it RV}}$ of the relative RVs. The asterisk marks RVs based on the average of two single measurements for which the errors are standard deviations. The last column gives the weighted mean RV for the individual objects and the error of this mean, which takes into account an uncertainty of 400 m s^-1 for the zero point of the velocity.
Table 2: RVs for (very) low-mass stars (M2.5-M5) in Cha I. See Table 1 for details.
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).
Table A.1: Observing log: UVES spectroscopy of BDs and (very) low-mass stars in Cha I. Given are the date of the observation, heliocentric Julian day (HJD) at the middle of the exposure, the exposure time, and the radial velocity RV for each spectrum.
Table A.2: Observing log: UVES spectroscopy continued. See Table A.1 for details.