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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]

LP 71-82

An R band light curve for LP 71-82 showing flares, adapted from Baran et al. (2013)[1]
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 mas/yr[3]
Dec.: -383.789 mas/yr[3]
Parallax (π)128.3057 ± 0.0319 mas[3]
Distance25.420 ± 0.006 ly
(7.794 ± 0.002 pc)
Details[4]
Mass0.16±0.01 M
Radius0.195±0.002 R
Luminosity0.0033±0.0003 L
Habitable zone inner limit0.06
Habitable zone outer limit0.12
Surface gravity (log g)4.5[5] cgs
Temperature3124±51 K
Rotation0.28018±0.000010 d
Rotational velocity (v sin i)11.3±1.5 km/s
Age0.5+1.1
0.34
 Gyr
Other designations
Gaia DR2 2161121135533953536, G 227-22, LP 71-82, LSPM J1802+6415, NLTT 45873, GSC 04209-01465, 2MASS J18021660+6415445
Database references
SIMBADdata

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. Mt. Suhora Survey – Searching for Pulsating M Dwarfs. III
  2. The CARMENES search for exoplanets around M dwarfs High-resolution optical and near-infrared spectroscopy of 324 survey stars, 2017, arXiv:1711.06576
  3. 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. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  4. Persistent starspot signals on M dwarfs: multi-wavelength Doppler observations with the Habitable-zone Planet Finder and Keck/HIRES, 2020, arXiv:2005.09657
  5. A Catalog of M-dwarf Flares with ASAS-SN, 2019, arXiv:1912.05549
  6. Reliable probabilistic determination of membership in stellar kinematic groups in the young disk, Table 4
  7. The AstraLux Multiplicity Survey: Extension to Late M-dwarfs, 2014, arXiv:1406.0535
  8. Magnetic fields in M dwarfs from the CARMENES survey, 2019, arXiv:1904.12762



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