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LP 71-82

Summary

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 edit

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 edit

  1. ^ a b c Mt. Suhora Survey – Searching for Pulsating M Dwarfs. III
  2. ^ Reiners, A.; et al. (2017), "The CARMENES search for exoplanets around M dwarfs", Astronomy & Astrophysics, 612: A49, arXiv:1711.06576, doi:10.1051/0004-6361/201732054
  3. ^ 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. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  4. ^ a b Robertson, Paul; Stefansson, Gudmundur; Mahadevan, Suvrath; Endl, Michael; Cochran, William D.; Beard, Corey; Bender, Chad F.; Diddams, Scott A.; Duong, Nicholas; Ford, Eric B.; Fredrick, Connor; Halverson, Samuel; Hearty, Fred; Holcomb, Rae; Juan, Lydia; Kanodia, Shubham; Lubin, Jack; Metcalf, Andrew J.; Monson, Andrew; Ninan, Joe P.; Palafoutas, Jonathan; Ramsey, Lawrence W.; Roy, Arpita; Schwab, Christian; Terrien, Ryan C.; Wright, Jason T. (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, arXiv:2005.09657, Bibcode:2020ApJ...897..125R, doi:10.3847/1538-4357/ab989f, S2CID 218718929
  5. ^ a b 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, arXiv:1912.05549, doi:10.3847/1538-4357/ab793a, S2CID 209323915
  6. ^ Reliable probabilistic determination of membership in stellar kinematic groups in the young disk, Table 4
  7. ^ 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, arXiv:1406.0535, Bibcode:2014ApJ...789..102J, doi:10.1088/0004-637X/789/2/102, S2CID 118403775
  8. ^ Shulyak, D.; Reiners, A.; Nagel, E.; Tal-Or, L.; Caballero, J. A.; Zechmeister, M.; Béjar, V. J. S.; Cortés-Contreras, M.; Martin, E. L.; Kaminski, A.; Ribas, I.; Quirrenbach, A.; Amado, P. J.; Anglada-Escudé, G.; Bauer, F. F.; Dreizler, S.; Guenther, E. W.; Henning, T.; Jeffers, S. V.; Kürster, M.; Lafarga, M.; Montes, D.; Morales, J. C.; Pedraz, S. (2019), "Magnetic fields in M dwarfs from the CARMENES survey", Astronomy & Astrophysics, 626: A86, arXiv:1904.12762, Bibcode:2019A&A...626A..86S, doi:10.1051/0004-6361/201935315, S2CID 139101130