Table 1.
Main properties of the bitrinsic S stars.
| o1 Ori | BD+79°156 | |
|---|---|---|
| Basic data | ||
| Sp. type | M3SIII | S4/2 |
| V (mag) | 4.72 | 9.55 |
| K (mag) | 0.48 | 5.67 |
| ϖ ± σϖ (mas) | 6.16 ± 0.41 | 0.57 ± 0.03 |
| EB − V | 0.07 | 0.26 |
| BCK (mag) | 2.91 | 2.85 |
| Atmospheric parameters | ||
| Teff (K) | 3500 | 3600 |
| (3500−3600) | (3600−3700) | |
| L(L⊙) | 2700 | 2800 |
| (2300−3100) | (2700−2900) | |
| log g | 1 | 1 |
| (0−2) | (1−3) | |
| M (M⊙) | 1.5 | 2.0 |
| (1.3−2) | (1.5−2.5) | |
| C/O | 0.75 | 0.50 |
| (0.50−0.90) | (0.50−0.75) | |
| [s/Fe] | 0 | 1 |
| (0−1) | (1−1) | |
| [Fe/H] | −0.28 | −0.16 |
| σ[Fe/H] | 0.19 | 0.12 |
Notes. V and K magnitudes have been extracted from the SIMBAD Astronomical Database (Wenger et al. 2000). The parallax ϖ and its uncertainty σϖ are from GDR2 (Gaia Collaboration 2018). The reddenning EB − V has been obtained from the Gontcharov (2012) extinction maps. BCK is the bolometric correction in the K band as computed from the MARCS model atmospheres. Atmospheric parameters for bitrinsic stars are also given (see Sect. 3). Values between parentheses correspond to the parameter range provided by the χ2 fitting. The metallicities [Fe/H] have been obtained from the Fe abundance analyses. The standard deviation σ[Fe/H] represents the line-to-line scatter on [Fe/H]. The masses have been derived from the locations of the stars in the HR diagram compared to the STAREVOL tracks.
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