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Table 2

Selection criteria applied to Gaia EDR3 to define the hot sub-dwarf candidate selection from colour and reduced proper motion using sources with unreliable parallax measurements.

1. Gaia EDR3 hot subluminous star colour-HG ranges
–0.7 ≤ (GbpGrp) ≤ 0.7
–10 ≤ H ≤ 17

2. Astrometric quality selection criteria
parallax_over_error ≤ 5
pm_over_error > 5
astrometric_sigma5d_max < 1.5

3. Photometric quality selection criteria
(phot_bp_n_obs > 2 AND phot_rp_n_obs > 2) OR phot_g_mean_mag < 19

4. Gaia EDR3 colour-H_G main sequence region rejection criterion
H < –9.26(GBP – GRP)2 + 24.4(GBP – GRP) + 10.8

5. White dwarf region rejection criterion
H < 342.5(GBPGRP)4 + 40.8(GBPGRP)3 + 13.7(GBPGRP)2 + 4.6(GBPGRP) + 14.7

6. Magellanic Cloud rejection criteria
within 15° of RA = 81.28°, Dec = –69.78° OR within 9° of RA = 12.8°, Dec = –73.15°

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