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Table 1
Selection criteria applied to Gaia EDR3 to define the hot sublu-minous star candidate selection from colour and absolute G magnitude using sources with good parallax.
| 1. Gaia EDR3 initial hot subluminous star CMD ranges |
| –0.7 ≤ (Gbp – Grp) ≤ 0.7 |
| –5 ≤ Gabs ≤ 7 |
| 2. Astrometric quality selection criteria |
| parallax > 0 |
| parallax_over_error > 5 |
| astrometric_sigma5d_max < 1.5 |
| 3. Photometric quality selection criteria |
| |phot_bp_rp_excess_factor_corrected| < 0.6 |
| 4. Gaia EDR3 CMD main sequence region rejection criterion |
| Gabs < 17.7(Gbp – Grp)3 – 6.9(Gbp – Grp)2 + 7.35(Gbp – Grp) + 1.95 |
| 5. Strict hot subluminous star selection criterion |
| Gabs < 12.0(Gbp – Grp)3 + 12.9(Gbp – Grp)2 + 6.8(Gbp – Grp) + 3.53 |
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