Free Access
Table 2
General data of USco1621 AB and USco1556 AB.
| USco1621 AB | USco1556 AB | |||||
|---|---|---|---|---|---|---|
| Primary | Secondary | Primary | Secondary | |||
| Astrometry | ||||||
| RA (J2000) | 16:21:29.53 | 16:21:28.31 | 15:56:24.92 | 15:56:23.43 | ||
| Dec (J2000) | −25:29:43.1 | −25:29:56.1 | −25:41:20.3 | −25:41:05.7 | ||
| Parallax Gaia (mas) | 7.22 ± 0.05 | – | 7.08 ± 0.08 | – | ||
| Distance (pc) | 138 ± 1 | – | 141 ± 2 | – | ||
| Separation (′′) | 20.78 ± 0.02 | 24.78 ± 0.02 | ||||
| Separation (AU) | 2880 ± 20 | 3500 ± 40 | ||||
| (μαcosδ, μδ) Gaia DR2 (mas yr−1) | (−6.14, −25.62) | – | (−18.45, −22.39) | – | ||
| ±(0.10, 0.07) | ±(0.13, 0.08) | |||||
| (μαcosδ, μδ) VHS–UKIDSS (mas yr−1) | – | (−7, −18) ± (10, 10) | – | (−19, −18) ± (10, 10) | ||
| Spectroscopy | ||||||
| Spectral type | M2.5 (a) | M8.5 ± 0.5 (OPT), L0 ± 0.5(NIR) | M3.0 (a) | M8.5 ± 0.5 (OPT), L0.5 ± 0.5 (NIR) | ||
| Li 6708 EW (Å) | 0.29 ± 0.02 (a) | – | 0.27 ± 0.02 (a) | – | ||
| Hα EW (Å) | −4.29 ± 0.06 (a) | – | −5.67 ± 0.04 (a) | – | ||
| Photometry | ||||||
| Gaia G | 14.1769 ± 0.0008 | 21.11 ± 0.03 | 14.310 ± 0.003 | – | ||
| Pan-STARRS g | 16.117 ± 0.003 | – | 16.15 ± 0.02 | – | ||
| Pan-STARRS r | 14.706 ± 0.004 | – | 14.865 ± 0.013 | – | ||
| Pan-STARRS i | – | 20.53 ± 0.06 | 13.68 ± 0.03 | 21.05 ± 0.12 | ||
| Pan-STARRS z | – | 19.11 ± 0.05 | 12.986 ± 0.005 | 19.39 ± 0.06 | ||
| Pan-STARRS y | 12.519 ± 0.001 | 18.02 ± 0.03 | 12.670 ± 0.002 | 18.14 ± 0.04 | ||
| DENIS I | 12.77 ± 0.02 | – | – | – | ||
| DENIS J | 11.11 ± 0.07 | 15.9 ± 0.2 | – | – | ||
| GCS Z | 12.1521 ± 0.0009 | 18.34 ± 0.04 | 12.2534 ± 0.0010 | 18.54 ± 0.04 | ||
| GCS Y | 11.7760 ± 0.0008 | 17.03 ± 0.02 | 11.9184 ± 0.0008 | 17.22 ± 0.02 | ||
| GCS J | 11.0888 ± 0.0005 | 15.985 ± 0.010 | 11.3606 ± 0.0008 | 16.163 ± 0.012 | ||
| GCS H | – | – | 11.1524 ± 0.0007 | 15.489 ± 0.013 | ||
| GCS K | 10.5627 ± 0.0004 | 14.636 ± 0.006 | 10.4900 ± 0.0004 | 14.812 ± 0.007 | ||
| VHS J | – | 15.942 ± 0.010 | – | 16.166 ± 0.010 | ||
| VHS Ks | – | 14.704 ± 0.011 | – | 14.904 ± 0.015 | ||
| 2MASS J | 11.18 ± 0.02 | 16.17 ± 0.08 | 11.37 ± 0.02 | 16.11 ± 0.08 | ||
| 2MASS H | 10.43 ± 0.02 | 15.34 ± 0.10 | 10.69 ± 0.02 | 15.39 ± 0.09 | ||
| 2MASS Ks | 10.19 ± 0.02 | 14.67 ± 0.09 | 10.44 ± 0.02 | 14.85 ± 0.12 | ||
| WISE W1 | 10.04 ± 0.02 | 14.09 ± 0.04 | 10.32 ± 0.02 | 14.45 ± 0.03 | ||
| WISE W2 | 9.90 ± 0.02 | 13.65 ± 0.06 | 10.18 ± 0.02 | 14.10 ± 0.05 | ||
| WISE W3 | 9.55 ± 0.10 | >11.3 | 9.93 ± 0.07 | – | ||
| Physical parameters | ||||||
| Rot. period (days) | 2.06 (b) | – | 4.67 (b) | – | ||
| Log (Lbol /L⊙) | −1.02 ± 0.03 | −3.03 ± 0.11 | −1.09 ± 0.04 | −3.07 ± 0.11 | ||
| Effective temp. (K) | 3460 ± 100 | 2270 ± 90 | 3410 ± 100 | 2240 ± 100 | ||
| Mass (M⊙) | 0.36 ± 0.08 | 0.015 ± 0.002 | 0.33 ± 0.07 | 0.014 ± 0.002 | ||
Notes. (a) Spectral type and Lithium and Hα equivalent widths from Rizzuto et al. (2015). (b)Rotation period from Rebull et al. (2018).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.