Table 5.
Parameters of HD 77581 derived by different authors.
| Reference | log L | EB − V | T⋆ | vrot sin i | log g⋆ | |
|---|---|---|---|---|---|---|
| [L⊙] | [mag] | [kK] | [km s−1] | [cgs] | Comments | |
| Wickramasinghe et al. (1974) | – | 0.75 | 20–28 | ∼90 | 2.5–3.0 | RV, spectrum and reddening |
| Mikkelsen & Wallerstein (1974) (MW74) | 5.2 | 0.75 | 22 | 130 | 2.64–2.80 | |
| Lamers et al. (1976) | – | – | 26.3 | – | – | |
| Ammann & Mauder (1978) | – | – | – | 89 ± 5 | – | HeI line fitting |
| Conti (1978) (C78) | 5.7 | 0.73 | 26 | (MW74) | – | |
| Dupree et al. (1980) | (C78) | 0.7 | (C78) | – | – | |
| Sadakane et al. (1985) | 5.53 | – | 25 ± 1 | – | – | |
| Vanbeveren et al. (1993) | 5.5–5.7 | – | 26 | 130 | 2.75–2.76 | |
| Zuiderwijk (1995) | – | – | – | 116 ± 6 | – | HeI line profiles |
| Howarth et al. (1997) | – | – | – | 114 | – | Cross-correlating IUE spectra |
| Fraser et al. (2010) (F10) | – | – | 26.5 | 56 | 2.90 | Arrive at mass of 40 M⊙ |
| Falanga et al. (2015) | – | – | – | 130.3 ± 0.2 | – | From system geometry |
| Krtička et al. (2015) | 5.63 | – | 27 | – | – | |
| Giménez-García et al. (2016) | 5.5 ± 0.1 | 0.77 ± 0.05 | 24.4 ± 1.0 | (F10) | 2.86 ± 0.10 | Uses d = 2.0 ± 0.2 kpc |
| Sander et al. (2018), no X-rays | 5.485 | – | 23.5 | (F10) | 2.84 | same distance as above |
| – ditto –, moderate X-ray illum. | – ditto – | – | 23.5 | – ditto – | – | |
| – ditto –, strong X-ray illum. | – ditto – | – | 23.8 | – ditto – | – | |
| This work (Sect. 5.5) | 5.8–6.2 | 0.689 ± 0.018 | 33.7 ± 5.2 | – | 3.28 ± 0.19 | Uses d = 1.99 kpc |
Notes. See Sect. 3.2.3 for notes on the different approaches used. For Giménez-García et al. (2016) and Sander et al. (2018), the temperature we report here as T⋆ corresponds to the parameter T2/3 as defined in the PoWR code used by these publications. For mass and radius estimates, see Table 4.
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