{{Short description|Red dwarf star in the constellation Draco}} {{Sky |18|02|16.60|+|64|15|44.6|25.42}} {{Starbox begin |name=LP 71-82 }} {{Starbox image | image = [[Image:LP71-82LightCurve.png|250px]] | caption = An [[Photometric_system#Photometric_letters|R band]] [[light curve]] for LP 71-82 showing flares, adapted from Baran ''et al.'' (2013)<ref name=Baran2014/> }} {{Starbox observe |epoch=[[J2000.0]] |constell=[[Draco (constellation)|Draco]] |ra={{RA|18|02|16.60}} |dec={{DEC|64|15|44.6}} |appmag_v= 13.51<ref name=Baran2014/> }} {{Starbox character |class=M5.0V | appmag_1_passband = J | appmag_1 = 8.54<ref>{{citation|arxiv=1711.06576|year=2017|title=The CARMENES search for exoplanets around M dwarfs|doi=10.1051/0004-6361/201732054 |last1=Reiners |first1=A. |last2=Zechmeister |first2=M. |last3=Caballero |first3=J. A. |last4=Ribas |first4=I. |last5=Morales |first5=J. C. |last6=Jeffers |first6=S. V. |last7=Schöfer |first7=P. |last8=Tal-Or |first8=L. |last9=Quirrenbach |first9=A. |last10=Amado |first10=P. J. |last11=Kaminski |first11=A. |last12=Seifert |first12=W. |last13=Abril |first13=M. |last14=Aceituno |first14=J. |last15=Alonso-Floriano |first15=F. J. |last16=Ammler-von Eiff |first16=M. |last17=Antona |first17=R. |last18=Anglada-Escudé |first18=G. |last19=Anwand-Heerwart |first19=H. |last20=Arroyo-Torres |first20=B. |last21=Azzaro |first21=M. |last22=Baroch |first22=D. |last23=Barrado |first23=D. |last24=Bauer |first24=F. F. |last25=Becerril |first25=S. |last26=Béjar |first26=V. J. S. |last27=Benítez |first27=D. |last28=Berdinas̃ |first28=Z. M. |last29=Bergond |first29=G. |last30=Blümcke |first30=M. |journal=Astronomy & Astrophysics |volume=612 |pages=A49 |display-authors=1 }}</ref> |b-v= |u-b= |variable= }} {{Starbox astrometry |radial_v= | prop_mo_ra = 196.394 | prop_mo_dec = -383.789 | pm_footnote = <ref name=EDR3/> |parallax=128.3057 |p_error=0.0319 |parallax_footnote=<ref name=EDR3>{{cite Gaia EDR3|2161121135533953536}}</ref> |absmag_v= }} {{Starbox detail | source = <ref name=Robertson2020/> | mass = 0.16{{±|0.01}} | radius = 0.195{{±|0.002}} | luminosity = 0.0033{{±|0.0003}} | gravity = 4.5<ref name=Martinez2019>{{citation|arxiv=1912.05549|year=2019|title=A Catalog of M-dwarf Flares with ASAS-SN|doi=10.3847/1538-4357/ab793a |last1=Rodríguez Martínez |first1=Romy |last2=Lopez |first2=Laura A. |last3=Shappee |first3=Benjamin J. |last4=Schmidt |first4=Sarah J. |last5=Jayasinghe |first5=Tharindu |last6=Kochanek |first6=Christopher S. |last7=Auchettl |first7=Katie |last8=Holoien |first8=Thomas W.-S. |journal=The Astrophysical Journal |volume=892 |issue=2 |page=144 |s2cid=209323915 |doi-access=free }}</ref> | temperature = 3124{{±|51}} | metal = <!--Metallicity (no units provided by template)--> | metal_fe = <!--Metallicity ([Fe/H] dex) --> | rotation = 0.28018{{±|0.000010}} [[day|d]] | rotational_velocity = 11.3{{±|1.5}} | age_gyr = 0.5{{±|1.1|0.34}} | habitable_inner = 0.06 | habitable_outer = 0.12 }} {{Starbox catalog|names={{odlist |G=227-22 |LP=71-82 |LSPM=J1802+6415 |NLTT=45873 |2MASS=J18021660+6415445 |GSC=04209-01465 |Gaia DR2=2161121135533953536 }}}} {{Starbox reference |Simbad=G+227-22 }} {{Starbox end}}
'''LP 71-82''' is a [[red dwarf]] star, located in constellation [[Draco (constellation)|Draco]] at 25.42 [[light-year]]s (7.79 [[Parsec|parsecs]]) from Earth.{{r|EDR3}} Kinematically, it is probably belongs to the [[Ursa Major Moving Group]].<ref>[https://www.aanda.org/articles/aa/full_html/2014/07/aa22575-13/T5.html Reliable probabilistic determination of membership in stellar kinematic groups in the young disk, Table 4]</ref>
LP 71-82 is a flare star with a very strong activity,<ref name=Baran2014>[http://acta.astrouw.edu.pl/Vol63/n1/pdf/pap_63_1_4.pdf Mt. Suhora Survey – Searching for Pulsating M Dwarfs. III]</ref> with at least four flares detected by 2019.<ref name=Martinez2019/> 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.<ref name=Robertson2020>{{citation|arxiv=2005.09657|year=2020|title=Persistent Starspot Signals on M Dwarfs: Multiwavelength Doppler Observations with the Habitable-zone Planet Finder and Keck/HIRES|doi=10.3847/1538-4357/ab989f |last1=Robertson |first1=Paul |last2=Stefansson |first2=Gudmundur |author3-link=Suvrath Mahadevan |last3=Mahadevan |first3=Suvrath |last4=Endl |first4=Michael |last5=Cochran |first5=William D. |last6=Beard |first6=Corey |last7=Bender |first7=Chad F. |last8=Diddams |first8=Scott A. |last9=Duong |first9=Nicholas |last10=Ford |first10=Eric B. |last11=Fredrick |first11=Connor |last12=Halverson |first12=Samuel |last13=Hearty |first13=Fred |last14=Holcomb |first14=Rae |last15=Juan |first15=Lydia |last16=Kanodia |first16=Shubham |last17=Lubin |first17=Jack |last18=Metcalf |first18=Andrew J. |last19=Monson |first19=Andrew |last20=Ninan |first20=Joe P. |last21=Palafoutas |first21=Jonathan |last22=Ramsey |first22=Lawrence W. |last23=Roy |first23=Arpita |last24=Schwab |first24=Christian |last25=Terrien |first25=Ryan C. |last26=Wright |first26=Jason T. |journal=The Astrophysical Journal |volume=897 |issue=2 |page=125 |bibcode=2020ApJ...897..125R |s2cid=218718929 |doi-access=free }}</ref> The star has a magnetic fields in chromosphere in 3.8-4.7 [[Gauss_(unit)|kilogauss]] range.<ref>{{citation|arxiv=1904.12762|year=2019|title=Magnetic fields in M dwarfs from the CARMENES survey|doi=10.1051/0004-6361/201935315 |last1=Shulyak |first1=D. |last2=Reiners |first2=A. |last3=Nagel |first3=E. |last4=Tal-Or |first4=L. |last5=Caballero |first5=J. A. |last6=Zechmeister |first6=M. |last7=Béjar |first7=V. J. S. |last8=Cortés-Contreras |first8=M. |last9=Martin |first9=E. L. |last10=Kaminski |first10=A. |last11=Ribas |first11=I. |last12=Quirrenbach |first12=A. |last13=Amado |first13=P. J. |last14=Anglada-Escudé |first14=G. |last15=Bauer |first15=F. F. |last16=Dreizler |first16=S. |last17=Guenther |first17=E. W. |last18=Henning |first18=T. |last19=Jeffers |first19=S. V. |last20=Kürster |first20=M. |last21=Lafarga |first21=M. |last22=Montes |first22=D. |last23=Morales |first23=J. C. |last24=Pedraz |first24=S. |journal=Astronomy & Astrophysics |volume=626 |pages=A86 |bibcode=2019A&A...626A..86S |s2cid=139101130 }}</ref>
Multiplicity surveys did not find any stellar companions to LP 71-82 as in 2014.<ref>{{citation|arxiv=1406.0535|year=2014|title=The Astralux Multiplicity Survey: Extension to Late M-Dwarfs|doi=10.1088/0004-637X/789/2/102 |last1=Janson |first1=Markus |last2=Bergfors |first2=Carolina |last3=Brandner |first3=Wolfgang |last4=Kudryavtseva |first4=Natalia |last5=Hormuth |first5=Felix |last6=Hippler |first6=Stefan |last7=Henning |first7=Thomas |journal=The Astrophysical Journal |volume=789 |issue=2 |page=102 |bibcode=2014ApJ...789..102J |s2cid=118403775 }}</ref>
==References== {{reflist}}
{{Stars of Draco}}
[[Category:Draco (constellation)]] [[Category:M-type main-sequence stars]] [[Category:Flare stars]]
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