Astronomy:LP 71-82
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Short description: Red dwarf star in the constellation Draco
Coordinates: 
18h 02m 16.60s, +64° 15′ 44.6″
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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
- ↑ 1.0 1.1 1.2 Mt. Suhora Survey – Searching for Pulsating M Dwarfs. III
- ↑ Reiners, A. et al. (2017), "The CARMENES search for exoplanets around M dwarfs", Astronomy & Astrophysics 612: A49, doi:10.1051/0004-6361/201732054
- ↑ 3.0 3.1 3.2 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 4.0 4.1 Robertson, Paul; Stefansson, Gudmundur; Mahadevan, Suvrath; Endl, Michael; Cochran, William D.; Beard, Corey; Bender, Chad F.; Diddams, Scott A. et al. (2020), "Persistent Starspot Signals on M Dwarfs: Multiwavelength Doppler Observations with the Habitable-zone Planet Finder and Keck/HIRES", The Astrophysical Journal 897 (2): 125, doi:10.3847/1538-4357/ab989f, Bibcode: 2020ApJ...897..125R
- ↑ 5.0 5.1 Rodríguez Martínez, Romy; Lopez, Laura A.; Shappee, Benjamin J.; Schmidt, Sarah J.; Jayasinghe, Tharindu; Kochanek, Christopher S.; Auchettl, Katie; Holoien, Thomas W.-S. (2019), "A Catalog of M-dwarf Flares with ASAS-SN", The Astrophysical Journal 892 (2): 144, doi:10.3847/1538-4357/ab793a
- ↑ Reliable probabilistic determination of membership in stellar kinematic groups in the young disk, Table 4
- ↑ Janson, Markus; Bergfors, Carolina; Brandner, Wolfgang; Kudryavtseva, Natalia; Hormuth, Felix; Hippler, Stefan; Henning, Thomas (2014), "The Astralux Multiplicity Survey: Extension to Late M-Dwarfs", The Astrophysical Journal 789 (2): 102, doi:10.1088/0004-637X/789/2/102, Bibcode: 2014ApJ...789..102J
- ↑ Shulyak, D.; Reiners, A.; Nagel, E.; Tal-Or, L.; Caballero, J. A.; Zechmeister, M.; Béjar, V. J. S.; Cortés-Contreras, M. et al. (2019), "Magnetic fields in M dwarfs from the CARMENES survey", Astronomy & Astrophysics 626: A86, doi:10.1051/0004-6361/201935315, Bibcode: 2019A&A...626A..86S
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