Open Access
Table 1
Criteria for selecting the BHB candidate stars.
| 1. Gaia DR3 CMD selection (see Appendix C): 30 228 objects |
| parallax > 0 parallax_over_error > 5 −0.4 < (Gbp – Gbp) < 0.5 Gabs < 138.07(GBP − GRP)6 − 153.85(GBP − GRP)5 - 40.727(GBP − GRP)4 + 73.368(GBP − GRP)3 −7.4054(GBP − GRP)2) - 9.5575GBP − GRP + 3.8459 Gabs > −3.2382(GBP − GRP)3 + 7.1259(GBP − GRP)2 − 3.583(GBP − GRP) − 0.2 vt >= 145 km s−1 |
| 2. Photometric quality selection criteria: 30088 objects |
| |C*| < 5.σc. |
| 3. Blended object rejection criterion: 23 619 objects |
| BHB candidate flux fraction from 5 arcsec radius > 0.7 |
| 4. RR-Lyrae removal criterion: 22 335 objects |
| Objects listed as RR-Lyrae in Simbad Objects considered RR-Lyra candidates in Gaia DR3 excess_flux_error > 6.0 |
| 5. BHB candidates with wide wavelength range photometric data: 10604 objects |
| from 2000 Å to 8000 Å |
| 6. SEDs calculated without error flags: 10 222 objects |
| At least five photometry measurements used for the fit Maximum 20% uncertainty in radius Maximum 0.3dex uncertainty in log(L) |
| 5. SED-generated effective temperature and surface gravity plot within BHB region of Kiel diagram: 9172 objects |
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