Table 1.
Number of sources at each step of the data selection process (see Sect. 2).
# Members | Ground-based RV error | Gaia RV error | GaiaVtan error | ||
---|---|---|---|---|---|
(km s−1) | (km s−1) | (km s−1) | |||
Candidate members from literature | 236 | 0.5(*) | 0.6 (55) | 0.19 (222) | |
High quality RV (this work) | 81 | 0.3 | 0.6 (31) | 0.08 (79) | |
6D data (Gaia astrometry + high quality RV) | 79 | 0.3 | 0.6 (31) | 0.08 | |
Suspected SB (this work) | 2 | ||||
SB from literature | 35 | ||||
Single | 42 | ||||
Single following kinematic criteria (see Sect. 2.3) | 27 | 0.3 | 0.6 (13) | 0.05 | |
Confirmed by orbital analysis (bona fide sample) | 26 |
Notes. Columns 3–4 indicate the median radial velocity error obtained from ground-based surveys and from the Gaia DR2 catalogue, respectively. For comparison, in Col. 5 we indicate the median tangential errors obtained with the Gaia DR2 parallaxes and proper motions, obtained taking into account the correlation among the astrometric parameters. The number of Gaia sources used to estimate the median velocity errors is indicated in brackets in each case. (*)Median radial velocity errors published in the literature for the 137 stars with radial velocity previous to this work. This sample is inhomogeneous and may be affected by systematic errors among different studies.
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