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LP 944-20 - 版本历史
2026-07-23T02:51:01Z
本wiki上该页面的版本历史
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2023-06-12T21:48:56Z
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<p><b>新页面</b></p><div>{{Sky|03|39|35.22|-|35|25|44.09|20.961}}<br />
{{Starbox begin<br />
| name = LP 944-20<br />
}}<br />
{{Starbox observe<br />
| epoch = [[J2000]]<br />
| equinox = [[J2000]]<br />
| constell = [[天爐座]]<br />
| ra={{RA|03|39|35.220}}<ref name="SIMBAD">{{cite web<br />
| url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=LP+944-20<br />
| title=SIPS J0339-3525 -- Brown Dwarf (M<0.08solMass)<br />
| publisher=[[Centre de Données astronomiques de Strasbourg]]<br />
| accessdate=2009-12-14<br />
| archive-date=2021-08-31<br />
| archive-url=https://web.archive.org/web/20210831192948/https://simbad.u-strasbg.fr/simbad/sim-id?Ident=LP+944-20<br />
| dead-url=no<br />
}}</ref><br />
| dec={{DEC|–35|25|44.09}}<ref name="SIMBAD" /><br />
| appmag_v = 18.69<br />
}}<br />
{{Starbox character<br />
| class = M9<ref name="SIMBAD" /><br />
| appmag_1_passband = B<br />
| appmag_1 = ~20.17<ref name="SIMBAD" /><br />
| appmag_2_passband = I<br />
| appmag_2 = ~13.288<ref name="SIMBAD" /><br />
| appmag_3_passband = J<br />
| appmag_3 = {{val|10.725|0.021}}<ref name="SIMBAD" /><br />
| appmag_4_passband = H<br />
| appmag_4 = {{val|10.017|0.021}}<ref name="SIMBAD" /><br />
| appmag_5_passband = K<br />
| appmag_5 = {{val|9.548|0.023}}<ref name="SIMBAD" /><br />
}}<br />
{{Starbox astrometry<br />
| radial_v = <br />
| prop_mo_ra = {{val|309.001|0.050}}<ref name="GaiaEDR3"/><br />
| prop_mo_dec = {{val|269.058|0.064}}<ref name="GaiaEDR3"/><br />
| parallax = 155.5982<br />
| p_error = 0.0522<br />
| parallax_footnote = <ref name="GaiaEDR3">{{Cite Gaia EDR3|4860376345833699840}}</ref><br />
| absmag_v = 20.02<br />
}}<br />
{{Starbox detail<br />
| source = <ref name=Guenther2009/><br />
| mass =0.06{{±|0.04}}<br />
| radius=<br />
| luminosity=<br />
| temperature=2650{{±|30}}<br />
| metal=<br />
| rotation= <4.5 [[小時|hrs]]<br />
| rotational_velocity=28{{±|4}}<br />
| gravity=<br />
| age=320 {{±|80}} 百萬<br />
}}<br />
{{Starbox catalog<br />
| names =LP 944-20, SIPS J0339−3525, LEHPM 3451, 2MASSI J0339352−352544, [B2006] J033935.2−352544, APMPM J0340−3526, 2MASS J03393521-3525440, 2MASSW J0339352−352544, BRI B0337−3535, BRI 0337−3535, 2MUCD 10201, Gaia DR2 4860376345833699840<br />
}}<br />
{{Starbox reference<br />
| Simbad = LP+944-20<br />
}}<br />
{{Starbox image<br />
|image={{Location map|100x100|AlternativeMap=Fornax_constellation_map.svg<br />
|alt=LP 944-20 is located in the constellation Fornax<br />
|caption=LP 944-20在天爐座的位置|border=infobox|mark=Red_pog.png|width=320<br />
|label=LP 944-20<br />
|lat=32.5<br />
|long=17.6<br />
}}|caption=<br />
}}<br />
{{Starbox end}}<br />
<br />
'''LP 944-20'''是位於[[天爐座]]的一顆光譜類型為M9非常暗淡的[[棕矮星]]，距離太陽系20.9光年。[[視星等]]為18.69，[[近星研究會]]上列出的恆星中最暗淡的恆星之一。<br />
<br />
==物理特性==<br />
由於自轉週期短，這顆年輕的褐矮星表現出強烈而頻繁的[[X射線]]耀斑，並擁有光球層級高達135G的強磁場。<ref name=Guenther2009>{{citation |arxiv=0903.2340 |title=Short-term spectroscopic monitoring of two cool dwarfs with strong magnetic fields |year=2009 |doi=10.1051/0004-6361/200810216 |last1=Guenther |first1=E. W. |last2=Zapatero-Osorio |first2=María Rosa |last3=Mehner |first3=A. |last4=Martín |first4=Eduardo L. |journal=Astronomy & Astrophysics |volume=498 |issue=1 |pages=281–287 |bibcode=2009A&A...498..281G |s2cid=18611224 }}</ref>1999年12月15日，探測到X射線耀斑。<ref>{{cite journal |last1=Rutledge |first1=Robert E. |last2=Basri |first2=Gibor |last3=Martín |first3=Eduardo L. |last4=Bildsten |first4=Lars |title=Chandra Detection of an X-Ray Flare from the Brown Dwarf LP 944-20 |journal=The Astrophysical Journal |date=1 August 2000 |volume=538 |issue=2 |pages=L141–L144 |arxiv=astro-ph/0005559 |bibcode=2000ApJ...538L.141R |doi=10.1086/312817 |s2cid=17800872 }}</ref><ref>{{cite web|url=http://www.solstation.com/stars/lp944-20.htm|title=LP 944-20|website=Solstation.com|accessdate=2017-03-11|archive-date=2023-03-22|archive-url=https://web.archive.org/web/20230322113816/http://www.solstation.com/stars/lp944-20.htm|dead-url=no}}</ref><br />
<br />
2007年發表的觀測結果表明，LP 944-20的大氣層含有大量[[鋰]]，並且它有塵土飛揚的雲。<ref>{{cite journal | title=Lithium in LP944-20 |author1=Pavlenko, Ya. V. |author2=Jones, H. R. A. |author3=Martín, Eduardo L. |author4=Guenther, E. |author5=Kenworthy, M. A. |author6=Zapatero-Osorio, María Rosa |journal=[[Monthly Notices of the Royal Astronomical Society]] |volume=380 |issue=3 |pages=1285–96 |date=September 2007 |doi=10.1111/j.1365-2966.2007.12182.x |bibcode=2007MNRAS.380.1285P |arxiv=0707.0694 |s2cid=11186385 }}</ref><br />
<br />
==註釋==<br />
<references group="note" /><br />
<br />
==參考==<br />
{{reflist}}<br />
<br />
==外部連結==<br />
*[http://www.astro.gsu.edu/RECONS/TOP100.posted.htm "The 100 nearest star systems"] {{Wayback|url=http://www.astro.gsu.edu/RECONS/TOP100.posted.htm |date=20071112173559 }}, ''[[近星研究會]]''<br />
<br />
{{Nearest star systems|5}}<br />
{{Stars of Fornax}}<br />
<br />
[[Category:天爐座]]<br />
[[Category:2MASS天體|J03393521-3525440]]</div>
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