LP 71-82
Coordinates: 
18h 02m 16.60s, +64° 15′ 44.6″
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Draco |
| Right ascension | 18h 02m 16.60s |
| Declination | 64° 15′ 44.6″ |
| Apparent magnitude (V) | 13.51[1] |
| Characteristics | |
| Spectral type | M5.0V |
| Apparent magnitude (J) | 8.54[2] |
| Astrometry | |
| Proper motion (μ) | RA: 196.394[3] mas/yr Dec.: -383.789[3] mas/yr |
| Parallax (π) | 128.3057 ± 0.0319[3] mas |
| Distance | 25.420 ± 0.006 ly (7.794 ± 0.002 pc) |
| Details[4] | |
| Mass | 0.16±0.01 M☉ |
| Radius | 0.195±0.002 R☉ |
| Luminosity | 0.0033±0.0003 L☉ |
| Habitable zone inner limit | 0.06 |
| Habitable zone outer limit | 0.12 |
| Surface gravity (log g) | 4.5[5] cgs |
| Temperature | 3124±51 K |
| Rotation | 0.28018±0.000010 d |
| Rotational velocity (v sin i) | 11.3±1.5 km/s |
| Age | 0.5+1.1 −0.34 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
LP 71-82 is a red dwarf star, located in constellation Draco at 25.42 light-years from Earth.[3] Kinematically, it is probably belongs to the Ursa Major Moving Group.[6]
Multiplicity surveys do not found any stellar companions to LP 71-82 as in 2014.[7]
Physical properties[]
LP 71-82 is a flare star with a very strong activity,[1] with at least four flares detected by 2019.[5] Such activity is expected for a star with a short rotational period of just 6 hours. As a low mass star, it is fully convective. It is visible nearly pole-on, with rotational axis deflected from the Sun by 19±3° degrees.[4] The star has a magnetic fields in chromosphere in 3.8-4.7 kilogauss range.[8]
References[]
- ^ a b Mt. Suhora Survey – Searching for Pulsating M Dwarfs. III
- ^ The CARMENES search for exoplanets around M dwarfs High-resolution optical and near-infrared spectroscopy of 324 survey stars, 2017, arXiv:1711.06576
- ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
- ^ a b Persistent starspot signals on M dwarfs: multi-wavelength Doppler observations with the Habitable-zone Planet Finder and Keck/HIRES, 2020, arXiv:2005.09657
- ^ a b A Catalog of M-dwarf Flares with ASAS-SN, 2019, arXiv:1912.05549
- ^ Reliable probabilistic determination of membership in stellar kinematic groups in the young disk, Table 4
- ^ The AstraLux Multiplicity Survey: Extension to Late M-dwarfs, 2014, arXiv:1406.0535
- ^ Magnetic fields in M dwarfs from the CARMENES survey, 2019, arXiv:1904.12762
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- Draco (constellation)
- M-type main-sequence stars
- 2MASS objects
- Flare stars
- Red dwarf star stubs