Table 2.
Stellar parameters of the GJ1284 system and its two wide companions.
| Parameter | Value | References (a) | |||
|---|---|---|---|---|---|
| Name and identifiers | |||||
| Main identifier | G 273-59 | HD 221503 | BD-17 6768 | ||
| Gl | 1284 | 898 | 897A | 897B | |
| TIC | 9212046 | 434103018 | 434103039 | ||
| Coordinates and kinematics | |||||
| α (J2000) | 23:30:13.44 | 23:32:49.40 | 23:32:46.98 | 23:32:46.98 | 2 |
| δ (J2000) | −20:23:27.46 | −16:50:44.32 | −16:45:12.34 | −16:45:11.74 | 2 |
| π [mas] | 62.67 ± 0.09 | 68.70 ± 0.06 | 64.8 ± 4.1 (b) | 2, 2, 3 | |
| d [pc] | 15.906 ± 0.019 | 14.549 ± 0.006 | 15.15 ± 0.46 | 2, 2, 3 | |
| μα cos δ [mas a−1] | 313.50 ± 0.15 | 340.98 ± 0.12 | 352.0 ± 2.6 | 2, 2, 3 | |
| μδ [mas a−1] | −205.41 ± 0.15 | −218.98 ± 0.07 | −216.1 ± 2.7 | 2, 2, 3 | |
| Vr [km s−1] | 0.84 ± 0.14 | −0.845 ± 0.0012 | −1.6 ± 1.7 | 1, 2, 4 | |
| U [km s−1] | −13.837 ± 0.026 | −13.942 ± 0.009 | −15.4 ± 0.8 | 1 | |
| V [km s−1] | −22.499 ± 0.021 | −22.471 ± 0.007 | −23.7 ± 0.7 | 1 | |
| W [km s−1] | −10.231 ± 0.015 | −9.184 ± 0.003 | −9.1 ± 1.6 | 1 | |
| Spectral type and photometry | |||||
| SpT | M2–M2.5V + M3–M3.5V | K6.0V | M2.5V | 1, 4, 5 | |
| B [mag] | 12.59 ± 0.03 | 9.890 ± 0.019 | 11.79 ± 0.03 | 6, 7, 6 | |
| V [mag] | 11.11 ± 0.03 | 8.600 ± 0.013 | 10.34 ± 0.04 | 6, 7, 6 | |
| G [mag] | 9.9210 ± 0.0020 | 8.0816 ± 0.0008 | 10.033 ± 0.005 | 10.058 ± 0.004 | 2 |
| BP [mag] | 11.319 ± 0.003 | 8.829 ± 0.004 | 10.548 ± 0.008 | 10.556 ± 0.007 | 2 |
| RP [mag] | 8.777 ± 0.004 | 7.251 ± 0.004 | 8.198 ± 0.005 | 8.210 ± 0.009 | 2 |
| J [mag] | 7.200 ± 0.019 | 6.236 ± 0.019 | 6.71 ± 0.20 | 8 | |
| H [mag] | 6.61 ± 0.04 | 5.61 ± 0.03 | 6.08 ± 0.03 | 8 | |
| K [mag] | 6.329 ± 0.026 | 5.473 ± 0.016 | 5.858 ± 0.016 | 8 | |
| g [mag] | 12.4084 ± 0.0010 | 10.86 ± 0.05 | 9.70 ± 0.04 | 9 | |
| r [mag] | 10.50 ± 0.01 | 8.308 ± 0.011 | 9.91 ± 0.11 | 9 | |
| i [mag] | 10.88 ± 0.05 | 9.72 ± 0.08 | 8.765 ± 0.021 | 9 | |
| NUV [mag] | 18.02 ± 0.04 | 16.900 ± 0.015 | 17.253 ± 0.017 | 10, 11, 10 | |
| Additional information | |||||
| v sin i [km s−1] | 3.9 ± 1.2 | 7.47 ± 1.00 | 7.1 ± 1.2 | 12, 13, 4 | |
| pEW(Hα) [Å] | −3.23 ± 0.08 | 0.12 ± 0.04 | −1.051 | 12, 13, 14 | |
| log LX [erg s−1] (c) | 29.04 ± 0.04 | 28.15 ± 0.11 | 29.22 ± 0.044 | 15 | |
| Prot [d] | 7.45 ± 0.1 | 11.5 ± 0.1 | 5.00 ± 0.02 | 1 | |
Notes.
Reference numbers for the three systems are separated by commas; a single number is provided whenever it is the same for all of them.
For the purposes of this work we adopt the parallax value from GJ 898 given the high uncertainty on the parallax determination of GJ 897 and their proximity and shared kinematics.
Calculated using the relations from Riaz et al. (2006).
References. (1) This work; (2) Gaia eDR3: Gaia Collaboration (2016, 2021); (3) Tokovinin (2018); (4) Torres et al. (2006); (5) Riaz et al. (2006) ; (6) APASS: Henden et al. (2016); (7) SKY2000: Myers et al. (2015); (8) 2MASS: Skrutskie et al. (2006); (9) UCAC4: Zacharias et al. (2013); (10) Schneider et al. (2019); (11) Riedel et al. (2017); (12) Jeffers et al. (2018); (13) López-Santiago et al. (2010); (14) Jones & West (2016); (15) ROSAT: Voges et al. (1999).
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