Literature results from: (1) Eisenstein et al. (2006), (2) Kleinman et al. (2013), (3) Koester & Kepler (2015), (4) Kepler et al. (2015), (5) Coutu et al. (2019), (6) Gentile Fusillo et al. (2021), (7) and (8) X-shooter spectroscopic and SDSS + PS1 photometric fits presented in this paper, respectively. The sixth column states the synthetic spectra composition used in the fitting, where bracketed letters mark the estimation of those elements by independent fits (we refer to Section 2 and the main text for further details).
| Star . | |${T_{\mathrm{eff}}}$| (K) . | |${\log g}$| (dex) . | |${\log (\mathrm{H/He})}$| (dex) . | log (Ca/He) (dex) . | Synthetic spec . | Refs. . |
|---|---|---|---|---|---|---|
| 1109 + 1318 | 16242.0 ± 194 | 8.24 ± 0.10 | – | – | He | (2) |
| 16081 ± 130 | 8.06 ± 0.10 | −3.85 ± 0.33 | −6.46 ± 0.50 | He(+H + Z) | (3) | |
| 16722 ± 5342 | 8.21 ± 0.59 | – | – | He | (6) | |
| 16751 ± 5632 | 8.22 ± 0.61 | −5.0 | – | He + H | (6) | |
| 16308 ± 62 | 8.25 ± 0.03 | −4.01 ± 0.03 | −7.51 | He+H + Z | (7) | |
| 15623 ± 480 | 8.12 ± 0.10 | −4.05 | −7.51 | He+H + Z | (8) | |
| 1359–0217 | 17067 ± 104 | 8.12 ± 0.06 | – | – | He | (1) |
| 16778 ± 123 | 8.18 ± 0.06 | – | – | He | (2) | |
| 16973 ± 60 | 7.83 ± 0.05 | −3.33 ± 0.11 | −6.49 ± 0.30 | He(+H + Z) | (3) | |
| 16701 ± 2238 | 8.07 ± 0.25 | – | – | He | (6) | |
| 16634 ± 2309 | 8.08 ± 0.25 | −5.0 | – | He + H | (6) | |
| 16773 ± 55 | 8.14 ± 0.02 | −3.15 ± 0.02 | −7.23 | He+H + Z | (7) | |
| 13995 ± 285 | 7.78 ± 0.05 | −3.16 | −7.23 | He+H + Z | (8) | |
| 1516–0040 | 14961 ± 28 | 8.0 | −4.47 ± 0.10 | −7.38 ± 0.20 | He(+H + Z) | (3) |
| 15264 ± 50 | 8.21 ± 0.01 | – | – | He | (4) | |
| 13006 ± 735 | 7.95 ± 0.10 | −4.83 ± 0.08 | −8.59 ± 0.10 | He+H + Z | (5) | |
| 13081 ± 751 | 7.89 ± 0.12 | – | – | He | (6) | |
| 12987 ± 779 | 7.88 ± 0.12 | −5.0 | – | He + H | (6) | |
| 15448 ± 20 | 8.42 ± 0.01 | −4.50 ± 0.01 | −7.59 | He+H + Z | (7) | |
| 13193 ± 207 | 7.94 ± 0.03 | −5.0 | −7.59 | He+H + Z | (8) | |
| 1627 + 1723 | 15834 ± 174 | 7.98 ± 0.1 | – | – | He | (2) |
| 15795 ± 112 | 8.0 | <−5.02 | <−6.66 | He(+H + Z) | (3) | |
| 16407 ± 2233 | 8.17 ± 0.27 | – | – | He | (6) | |
| 16326 ± 2299 | 8.17 ± 0.28 | −5.0 | – | He + H | (6) | |
| 16134 ± 102 | 8.29 ± 0.05 | −5.05 ± 0.07 | −7.73 | He+H + Z | (7) | |
| 15903 ± 503 | 8.11 ± 0.09 | −5.13 | −7.73 | He+H + Z | (8) | |
| 2324–0018 | 23431 ± 697 | 5.01 ± 0.02 | – | − | – | sdB (1) |
| 8231 ± 39 | 9.43 ± 0.04 | – | – | He | (3) | |
| 12198 ± 1303 | 7.66 ± 0.29 | – | – | He | (6) | |
| 12039 ± 1473 | 7.64 ± 0.33 | −5.0 | – | He + H | (6) | |
| 14063 ± 53 | 8.25 ± 0.02 | −3.32 ± 0.01 | −8.99 | He+H + Z | (7) | |
| 12823 ± 325 | 7.66 ± 0.15 | −3.33 | −8.99 | He+H + Z | (8) |
| Star . | |${T_{\mathrm{eff}}}$| (K) . | |${\log g}$| (dex) . | |${\log (\mathrm{H/He})}$| (dex) . | log (Ca/He) (dex) . | Synthetic spec . | Refs. . |
|---|---|---|---|---|---|---|
| 1109 + 1318 | 16242.0 ± 194 | 8.24 ± 0.10 | – | – | He | (2) |
| 16081 ± 130 | 8.06 ± 0.10 | −3.85 ± 0.33 | −6.46 ± 0.50 | He(+H + Z) | (3) | |
| 16722 ± 5342 | 8.21 ± 0.59 | – | – | He | (6) | |
| 16751 ± 5632 | 8.22 ± 0.61 | −5.0 | – | He + H | (6) | |
| 16308 ± 62 | 8.25 ± 0.03 | −4.01 ± 0.03 | −7.51 | He+H + Z | (7) | |
| 15623 ± 480 | 8.12 ± 0.10 | −4.05 | −7.51 | He+H + Z | (8) | |
| 1359–0217 | 17067 ± 104 | 8.12 ± 0.06 | – | – | He | (1) |
| 16778 ± 123 | 8.18 ± 0.06 | – | – | He | (2) | |
| 16973 ± 60 | 7.83 ± 0.05 | −3.33 ± 0.11 | −6.49 ± 0.30 | He(+H + Z) | (3) | |
| 16701 ± 2238 | 8.07 ± 0.25 | – | – | He | (6) | |
| 16634 ± 2309 | 8.08 ± 0.25 | −5.0 | – | He + H | (6) | |
| 16773 ± 55 | 8.14 ± 0.02 | −3.15 ± 0.02 | −7.23 | He+H + Z | (7) | |
| 13995 ± 285 | 7.78 ± 0.05 | −3.16 | −7.23 | He+H + Z | (8) | |
| 1516–0040 | 14961 ± 28 | 8.0 | −4.47 ± 0.10 | −7.38 ± 0.20 | He(+H + Z) | (3) |
| 15264 ± 50 | 8.21 ± 0.01 | – | – | He | (4) | |
| 13006 ± 735 | 7.95 ± 0.10 | −4.83 ± 0.08 | −8.59 ± 0.10 | He+H + Z | (5) | |
| 13081 ± 751 | 7.89 ± 0.12 | – | – | He | (6) | |
| 12987 ± 779 | 7.88 ± 0.12 | −5.0 | – | He + H | (6) | |
| 15448 ± 20 | 8.42 ± 0.01 | −4.50 ± 0.01 | −7.59 | He+H + Z | (7) | |
| 13193 ± 207 | 7.94 ± 0.03 | −5.0 | −7.59 | He+H + Z | (8) | |
| 1627 + 1723 | 15834 ± 174 | 7.98 ± 0.1 | – | – | He | (2) |
| 15795 ± 112 | 8.0 | <−5.02 | <−6.66 | He(+H + Z) | (3) | |
| 16407 ± 2233 | 8.17 ± 0.27 | – | – | He | (6) | |
| 16326 ± 2299 | 8.17 ± 0.28 | −5.0 | – | He + H | (6) | |
| 16134 ± 102 | 8.29 ± 0.05 | −5.05 ± 0.07 | −7.73 | He+H + Z | (7) | |
| 15903 ± 503 | 8.11 ± 0.09 | −5.13 | −7.73 | He+H + Z | (8) | |
| 2324–0018 | 23431 ± 697 | 5.01 ± 0.02 | – | − | – | sdB (1) |
| 8231 ± 39 | 9.43 ± 0.04 | – | – | He | (3) | |
| 12198 ± 1303 | 7.66 ± 0.29 | – | – | He | (6) | |
| 12039 ± 1473 | 7.64 ± 0.33 | −5.0 | – | He + H | (6) | |
| 14063 ± 53 | 8.25 ± 0.02 | −3.32 ± 0.01 | −8.99 | He+H + Z | (7) | |
| 12823 ± 325 | 7.66 ± 0.15 | −3.33 | −8.99 | He+H + Z | (8) |
Literature results from: (1) Eisenstein et al. (2006), (2) Kleinman et al. (2013), (3) Koester & Kepler (2015), (4) Kepler et al. (2015), (5) Coutu et al. (2019), (6) Gentile Fusillo et al. (2021), (7) and (8) X-shooter spectroscopic and SDSS + PS1 photometric fits presented in this paper, respectively. The sixth column states the synthetic spectra composition used in the fitting, where bracketed letters mark the estimation of those elements by independent fits (we refer to Section 2 and the main text for further details).
| Star . | |${T_{\mathrm{eff}}}$| (K) . | |${\log g}$| (dex) . | |${\log (\mathrm{H/He})}$| (dex) . | log (Ca/He) (dex) . | Synthetic spec . | Refs. . |
|---|---|---|---|---|---|---|
| 1109 + 1318 | 16242.0 ± 194 | 8.24 ± 0.10 | – | – | He | (2) |
| 16081 ± 130 | 8.06 ± 0.10 | −3.85 ± 0.33 | −6.46 ± 0.50 | He(+H + Z) | (3) | |
| 16722 ± 5342 | 8.21 ± 0.59 | – | – | He | (6) | |
| 16751 ± 5632 | 8.22 ± 0.61 | −5.0 | – | He + H | (6) | |
| 16308 ± 62 | 8.25 ± 0.03 | −4.01 ± 0.03 | −7.51 | He+H + Z | (7) | |
| 15623 ± 480 | 8.12 ± 0.10 | −4.05 | −7.51 | He+H + Z | (8) | |
| 1359–0217 | 17067 ± 104 | 8.12 ± 0.06 | – | – | He | (1) |
| 16778 ± 123 | 8.18 ± 0.06 | – | – | He | (2) | |
| 16973 ± 60 | 7.83 ± 0.05 | −3.33 ± 0.11 | −6.49 ± 0.30 | He(+H + Z) | (3) | |
| 16701 ± 2238 | 8.07 ± 0.25 | – | – | He | (6) | |
| 16634 ± 2309 | 8.08 ± 0.25 | −5.0 | – | He + H | (6) | |
| 16773 ± 55 | 8.14 ± 0.02 | −3.15 ± 0.02 | −7.23 | He+H + Z | (7) | |
| 13995 ± 285 | 7.78 ± 0.05 | −3.16 | −7.23 | He+H + Z | (8) | |
| 1516–0040 | 14961 ± 28 | 8.0 | −4.47 ± 0.10 | −7.38 ± 0.20 | He(+H + Z) | (3) |
| 15264 ± 50 | 8.21 ± 0.01 | – | – | He | (4) | |
| 13006 ± 735 | 7.95 ± 0.10 | −4.83 ± 0.08 | −8.59 ± 0.10 | He+H + Z | (5) | |
| 13081 ± 751 | 7.89 ± 0.12 | – | – | He | (6) | |
| 12987 ± 779 | 7.88 ± 0.12 | −5.0 | – | He + H | (6) | |
| 15448 ± 20 | 8.42 ± 0.01 | −4.50 ± 0.01 | −7.59 | He+H + Z | (7) | |
| 13193 ± 207 | 7.94 ± 0.03 | −5.0 | −7.59 | He+H + Z | (8) | |
| 1627 + 1723 | 15834 ± 174 | 7.98 ± 0.1 | – | – | He | (2) |
| 15795 ± 112 | 8.0 | <−5.02 | <−6.66 | He(+H + Z) | (3) | |
| 16407 ± 2233 | 8.17 ± 0.27 | – | – | He | (6) | |
| 16326 ± 2299 | 8.17 ± 0.28 | −5.0 | – | He + H | (6) | |
| 16134 ± 102 | 8.29 ± 0.05 | −5.05 ± 0.07 | −7.73 | He+H + Z | (7) | |
| 15903 ± 503 | 8.11 ± 0.09 | −5.13 | −7.73 | He+H + Z | (8) | |
| 2324–0018 | 23431 ± 697 | 5.01 ± 0.02 | – | − | – | sdB (1) |
| 8231 ± 39 | 9.43 ± 0.04 | – | – | He | (3) | |
| 12198 ± 1303 | 7.66 ± 0.29 | – | – | He | (6) | |
| 12039 ± 1473 | 7.64 ± 0.33 | −5.0 | – | He + H | (6) | |
| 14063 ± 53 | 8.25 ± 0.02 | −3.32 ± 0.01 | −8.99 | He+H + Z | (7) | |
| 12823 ± 325 | 7.66 ± 0.15 | −3.33 | −8.99 | He+H + Z | (8) |
| Star . | |${T_{\mathrm{eff}}}$| (K) . | |${\log g}$| (dex) . | |${\log (\mathrm{H/He})}$| (dex) . | log (Ca/He) (dex) . | Synthetic spec . | Refs. . |
|---|---|---|---|---|---|---|
| 1109 + 1318 | 16242.0 ± 194 | 8.24 ± 0.10 | – | – | He | (2) |
| 16081 ± 130 | 8.06 ± 0.10 | −3.85 ± 0.33 | −6.46 ± 0.50 | He(+H + Z) | (3) | |
| 16722 ± 5342 | 8.21 ± 0.59 | – | – | He | (6) | |
| 16751 ± 5632 | 8.22 ± 0.61 | −5.0 | – | He + H | (6) | |
| 16308 ± 62 | 8.25 ± 0.03 | −4.01 ± 0.03 | −7.51 | He+H + Z | (7) | |
| 15623 ± 480 | 8.12 ± 0.10 | −4.05 | −7.51 | He+H + Z | (8) | |
| 1359–0217 | 17067 ± 104 | 8.12 ± 0.06 | – | – | He | (1) |
| 16778 ± 123 | 8.18 ± 0.06 | – | – | He | (2) | |
| 16973 ± 60 | 7.83 ± 0.05 | −3.33 ± 0.11 | −6.49 ± 0.30 | He(+H + Z) | (3) | |
| 16701 ± 2238 | 8.07 ± 0.25 | – | – | He | (6) | |
| 16634 ± 2309 | 8.08 ± 0.25 | −5.0 | – | He + H | (6) | |
| 16773 ± 55 | 8.14 ± 0.02 | −3.15 ± 0.02 | −7.23 | He+H + Z | (7) | |
| 13995 ± 285 | 7.78 ± 0.05 | −3.16 | −7.23 | He+H + Z | (8) | |
| 1516–0040 | 14961 ± 28 | 8.0 | −4.47 ± 0.10 | −7.38 ± 0.20 | He(+H + Z) | (3) |
| 15264 ± 50 | 8.21 ± 0.01 | – | – | He | (4) | |
| 13006 ± 735 | 7.95 ± 0.10 | −4.83 ± 0.08 | −8.59 ± 0.10 | He+H + Z | (5) | |
| 13081 ± 751 | 7.89 ± 0.12 | – | – | He | (6) | |
| 12987 ± 779 | 7.88 ± 0.12 | −5.0 | – | He + H | (6) | |
| 15448 ± 20 | 8.42 ± 0.01 | −4.50 ± 0.01 | −7.59 | He+H + Z | (7) | |
| 13193 ± 207 | 7.94 ± 0.03 | −5.0 | −7.59 | He+H + Z | (8) | |
| 1627 + 1723 | 15834 ± 174 | 7.98 ± 0.1 | – | – | He | (2) |
| 15795 ± 112 | 8.0 | <−5.02 | <−6.66 | He(+H + Z) | (3) | |
| 16407 ± 2233 | 8.17 ± 0.27 | – | – | He | (6) | |
| 16326 ± 2299 | 8.17 ± 0.28 | −5.0 | – | He + H | (6) | |
| 16134 ± 102 | 8.29 ± 0.05 | −5.05 ± 0.07 | −7.73 | He+H + Z | (7) | |
| 15903 ± 503 | 8.11 ± 0.09 | −5.13 | −7.73 | He+H + Z | (8) | |
| 2324–0018 | 23431 ± 697 | 5.01 ± 0.02 | – | − | – | sdB (1) |
| 8231 ± 39 | 9.43 ± 0.04 | – | – | He | (3) | |
| 12198 ± 1303 | 7.66 ± 0.29 | – | – | He | (6) | |
| 12039 ± 1473 | 7.64 ± 0.33 | −5.0 | – | He + H | (6) | |
| 14063 ± 53 | 8.25 ± 0.02 | −3.32 ± 0.01 | −8.99 | He+H + Z | (7) | |
| 12823 ± 325 | 7.66 ± 0.15 | −3.33 | −8.99 | He+H + Z | (8) |
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