Rejection of possible counterparts based on their location on the HRD. Big, black crosses correspond to possible and probable non-members. Candidate members are shown as open green circles (possible members) and solid green circles (probable members). The bolometric luminosity and the effective temperature were derived using a fixed value of the reddening (Av = 0.322) or it was derived during the fitting process (top- and bottom panels, respectively). Collinder 69 known members, located at similar distance, are displayed as blue plus symbols, and were selected from Dolan & Mathieu (1999), Barrado y Navascués et al. (2007), Morales-Calderón (2008) and Barrado et al. (2011). Isochrones correspond to a 20 Myr isochrone from Siess et al. (2000) – upper part of the main sequence, in black – and Settl models – blue lines with 1, 20 and 10 000 Myr – from the Lyon group (Allard et al. 2012). We note that some possible members can be found well below the Collinder 69 cluster sequence.
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