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Table 4.
Summary of the numbers of Praesepe sources from earlier studies recovered in our Gaia sample (i.e. up to three times the tidal radius of the cluster).
| Method | in Gaia | Kinematic | in Rtidal | Comments |
|---|---|---|---|---|
| (Jones & Cudworth 1983) | 269/282 | 179 | 144 | Palomar photographic plates |
| Hambly et al. (1995) | 495/515 | 407 | 269 | Photographic plates |
| Pinfield et al. (1997) | 7/26 | 2 | 1 | Follow-up in Hodgkin et al. (1999) and Pinfield et al. (2003) |
| Kraus & Hillenbrand (2007) | 1083/1130 | 948 | 595 | Census of the cluster |
| González-García et al. (2006) | 2/20 | 0 | 0 | Deep survey focusing on substellar members |
| Boudreault et al. (2010) | 86/151 | 40 | 25 | Wide-field I + JK survey |
| Baker et al. (2010) | 137/145 | 97 | 49 | Cross-match of SDSS and UKIDSS DR7 |
| Wang et al. (2011) | 6/59 | 2 | 1 | Deep pencil-beam survey for brown dwarfs |
| Boudreault et al. (2012) | 980/1116 | 751 | 407 | UKIDSS GCS DR9; see also (Boudreault & Lodieu 2013) |
| Khalaj & Baumgardt (2013) | 864/893 | 726 | 490 | Cross-match of PPMXL and SDSS |
| Wang et al. (2014) | 991/1040 | 825 | 568 | Cross-match of MASS, PPMXL, and Pan-STARRS |
| Gaia Collaboration (2018a) | 938/938 | 920 | 644 | Gaia DR2 |
Notes. We have 139, 336, 721, and 1847 kinematic member candidates in 3.5, 5.9, 10.7, and 32.1 pc, respectively.
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