Table 1
EV Lac stellar properties.
| Parameter | Value | Units | Ref. |
|---|---|---|---|
| Astrometric properties | |||
| Names | GJ873, EV Lac | ||
| α (J2000) | 22:46:49.73 | deg | 1 |
| δ (J2000) | +44:20:02.4 | deg | 1 |
| μα | –706.1 ± 0.1 | mas yr–1 | 1 |
| μδ | –458.8 ± 0.1 | mas yr–1 | 1 |
| parallax | 198.01 ± 0.04 | mas | 1 |
| distance | 5.049 ± 0.001 | pc | 1 |
| Physical parameters | |||
| Spectral type | M3.5 V | 2 | |
| Mass | 0.32 ± 0.02 | Μ⊙ | 3 |
| Radius | 0.31 ± 0.02 | R⊙ | 3 |
| log g | 4.87 ± 0.05 | log(cm s–2) | 3 |
| Age | 25–300 | Myr | 4 |
| Prot | 4.359 ± 0.002 | d | 5 |
| v sin(i) | 4.1 | km s–1 | 6 |
| i | 66 ± 28 | degree | 7 |
| Teff | 3340 ± 31 | Κ | 3 |
| Tspot (theoretical) | 2733 ± 542 | Κ | 8 |
| Tspot (photometry) | 3268 | Κ | 9 |
| Small scale < Β > | 4.53 ± 0.07 | kG | 3 |
| Large scale Bl | 300–500 | G | 10, 11 |
| Fe/H | –0.01 ± 0.15 | dex | 12 |
| EW Hα | –4.54 ± 0.04 | Å | 13 |
| EW Ca II Κ | 14.86 | Å | 14 |
| log LHα/Lbol | –3.76 | 13 | |
| log LX/Lbol | –3.33 | 10 | |
 |
–4.24 ± 0.11 | 15 | |
References. (1) Gaia Collaboration (2018), (2) Reid et al. (1995), (3) Cristofari et al. (2023), (4) Shkolnik et al. (2009), (5) Paudel et al. (2021), (6) Reiners et al. (2022), (7) Reiners et al. (2018), (8) Herbst etal. (2021), (9) Ikuta et al. (2023), (10) Morin et al. (2008), (11) Bellotti et al. (2024), (12) Rojas-Ayala et al. (2012), (13) Newton et al. (2017), (14) Youngblood et al. (2017), (15) Melbourne et al. (2020).
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