Table 4.
Effective temperatures, surface gravities, and helium abundances of the analyzed subluminous B-type stars compared to literature values.
| Object | Teff [K] | log(g[cm s−2]) | log n(4He + 3He) | log n(4He) | log n(3He) |  |
References |
|---|---|---|---|---|---|---|---|
| HD 4539 | 23 200 ± 100 | 5.20 ± 0.01 | −2.27 ± 0.24 | −2.27 ± 0.01 | <−4.89a | >410a | [1] |
| CD-35° 15910 | 27 200 ± 100 | 5.39 ± 0.01 | −2.94 ± 0.23 | −2.94 ± 0.01 | <−4.89a | >80a | [1] |
| 27 000 ± 1100 | 5.32 ± 0.14 | −2.90 ± 0.10 | [2] | ||||
| PHL 25b | 19 500 ± 100 |  |
−2.42 ± 0.18 | −2.75 ± 0.03b | −2.69 ± 0.03b | 0.87: | [1] |
| PHL 382b | 17 600 ± 100 | 3.92 ± 0.01 | −2.54 ± 0.20 | −3.25 ± 0.05b | −2.63 ± 0.02b | 0.24: | [1] |
| BD+48° 2721b |  |
4.81 ± 0.02 |  |
 b |
 b |
0.17: | [1] |
| 24 800 ± 1100 | 5.38 ± 0.14 | −2.23 ± 0.10 | [2] | ||||
| SB 290b c | 26 600 ± 100 | 5.42 ± 0.01 | −2.69 ± 0.22 |  b |
−2.73 ± 0.02b | 0.10: | [1] |
| EC 03263–6403 | 29 000 ± 200 | 5.21 ± 0.02 | −2.84 ± 0.24 |  |
 |
0.01 ± 0.01 | [1] |
| 29 300 ± 1100 | 5.48 ± 0.14 | −2.51 ± 0.10 | [2] | ||||
| EC 03591–3232b | 28 700 ± 100 | 5.61 ± 0.01 | −2.09 ± 0.23 |  b |
−2.11 ± 0.01b | 0.04: | [1] |
| 28 000 ± 1100 | 5.55 ± 0.14 | −2.03 ± 0.10 | [2] | ||||
| EC 12234–2607b | 28 900 ± 100 | 5.62 ± 0.02 |  |
 b |
−2.14 ± 0.05b | 3.09: | [1] |
| 28 000 ± 1100 | 5.58 ± 0.14 | −1.58 ± 0.10 | [2] | ||||
| EC 14338–1445 | 27 900 ± 100 |  |
−3.01 ± 0.21 |  |
−3.10 ± 0.03 | 0.22 ± 0.09 | [1] |
| 27 700 ± 1100 | 5.54 ± 0.14 | −2.82 ± 0.10 | [2] | ||||
| Feige 38 | 28 200 ± 100 | 5.61 ± 0.01 | −2.70 ± 0.21 |  |
−2.78 ± 0.02 |  |
[1] |
| PG 1710+490 | 29 200 ± 100 | 5.72 ± 0.02 | −2.66 ± 0.22 |  |
−2.70 ± 0.01 | 0.11 ± 0.04 | [1] |
| Feige 36d | 29 400 ± 100 | 5.97 ± 0.01 |  |
 |
 |
 |
[1] |
| 29 800 ± 100 | 5.97 ± 0.02 | −2.17 ± 0.02 | [3] | ||||
| HE 0929–0424d | 29 300 ± 100 | 5.65 ± 0.01 | −1.95 ± 0.19 | −2.10 ± 0.03 | −2.50 ± 0.06 | 2.51 ± 0.91 | [1] |
| 29 602 ± 529 | 5.69 ± 0.07 | −2.01 ± 0.07 | [4] | ||||
| HE 1047–0436d | 29 800 ± 100 | 5.65 ± 0.01 | −2.44 ± 0.18 | −2.76 ± 0.04 | −2.72 ± 0.03 | 0.91 ± 0.32 | [1] |
| 30 280 ± 529 | 5.71 ± 0.07 | −2.35 ± 0.07 | [4] |
Notes. In both cases the same high-resolution spectra were analyzed, but different approaches were used (see Sect. 4.2 for details). We give 1σ statistical single parameter errors for Teff, log(g), log n(4He), and log n(3He). The systematic uncertainties are ± 2% in Teff, and ± 0.10 for log(g), log n(4He), and log n(3He) in all cases. In the case of log n(4He+3He)} and n(4He)/n(3He), the given uncertainties result from the statistical and systematic errors on log n(3He) and log n(4He), for which Gaussian error propagation was used.
Anomalous helium line profiles (see Sect. 5.4). Therefore, the isotopic abundance ratio n(4He)/n(3He) is uncertain as indicated by a colon.
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