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IC 2391 - 版本历史
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<p><b>新页面</b></p><div>{{Infobox open cluster<br />
| name = IC 2391<br />
| image = File:IC 2391 in Vele.jpg<br />
| image_size = 240px<br />
| epoch = J2000.0<br />
| constellation = [[船帆座]] <br />
| class = [[疏散星團]]<br />
| ra = {{RA|08|40.6}}<br />
| dec = {{DEC|-53|02}}<br />
| dist_pc = 175 [[秒差距|pc]]<br />
| appmag_v = 2.5<br />
| size_v = 50′<br />
| mass_msol = <br />
| radius_ly = <br />
| age = <br />
| notes = <br />
| names = [[科德韦尔深空天体表|C]] 0838-528、[[科德韋爾天體|科德韋爾]]&nbsp;85<br />
}}<br />
<br />
'''IC 2391''' （也稱為'''船帆座ο星團'''或'''科德韋爾85'''）是在[[船帆座]]的一個[[疏散星團]]。據說在西元964年波斯天文學家[[阿爾蘇飛]]就已經描述過這個星團，它也被[[尼可拉·路易·拉卡伊]]發現，並紀錄為目錄中的Lac II 5。<br />
<br />
這個星團距離[[地球]]約500[[光年]]遠，並且用[[裸眼]]就能看見。它大約包含30顆恆星，散布在50弧分的空間中，總[[視星等|視亮度]]為2.5等。這個星團包括以下[[裸眼]]可見的恆星<ref name=platais>{{cite journal|bibcode=2007A&A...461..509P|arxiv=astro-ph/0611584|title=WIYN open cluster study. XXVI. Improved kinematic membership and spectroscopy of IC 2391|journal=Astronomy and Astrophysics|volume=461|issue=2|pages=509|last1=Platais|first1=I|last2=Melo|first2=C|last3=Mermilliod|first3=J. -C|last4=Kozhurina-Platais|first4=V|last5=Fulbright|first5=J. P|last6=Méndez|first6=R. A|last7=Altmann|first7=M|last8=Sperauskas|first8=J|year=2007|doi=10.1051/0004-6361:20065756}}</ref>：<br />
* [[船帆座ο]]<br />
* [[HD 74560]] （船帆座HY）<br />
* [[HD 74146]] （船帆座NZ）<br />
* [[HD 74071]] （船帆座HW）<br />
* [[HD 74196]]<br />
* [[HD 74535]] （船帆座KT）<br />
* [[HD 75466]] <br />
* [[HD 73952]]<br />
<br />
IC 2391似乎與疏散星團[[IC 2602]]有著相同的年齡<ref>{{cite journal<br />
|title=Rotational Velocities and Chromospheric/Coronal Activity of Low-Mass Stars in the Young Open Clusters IC 2391 and IC 2602<br />
|url=https://archive.org/details/sim_astrophysical-journal_1997-04-20_479_2/page/776<br />
|author=Stauffer, J.R.<br />
|display-authors=etal<br />
|journal=Astrophysical Journal<br />
|volume=479<br />
|issue=2<br />
|pages=776–791<br />
|bibcode=1997ApJ...479..776S<br />
|doi=10.1086/303930|date=1997<br />
}}</ref>，並且年齡大約是[[鋰衰竭界限]]的5,000萬歲<ref>{{cite journal<br />
|title=Spectroscopy of Very Low Mass Stars and Brown Dwarfs in IC 2391: Lithium Depletion and Hα Emission<br />
|url=https://archive.org/details/sim_astrophysical-journal_2004-10-10_614_1/page/386<br />
|author=Barrado y Navascues, D., Stauffer, J.R., & Jayawardhana, R.<br />
|date=2004<br />
|journal=Astrophysical Journal<br />
|volume=614<br />
|issue=1<br />
|pages=386–397<br />
|bibcode=2004ApJ...614..386B<br />
|doi=10.1086/423485<br />
|arxiv = astro-ph/0406436 <br />
}}</ref>。 IC 2391與[[IC 2391|百眼巨人星協]]（Argus Association）的共同移動恆星有著密切的關連。這個[[移動星群]]的成員可能包含[[五帝座一]]、[[孔雀九]]（孔雀座ε）、[[天倉增十八]]（鯨魚座49）、{{link-en|HD 61005|HD 61005}}、和[[天記增二]]（HD 88955）<ref name=Malo2013>{{citation<br />
| title=Bayesian Analysis to Identify New Star Candidates in Nearby Young Stellar Kinematic Groups<br />
| display-authors=1 | last1=Malo | first1=Lison<br />
| last2=Doyon | first2=René | last3=Lafrenière | first3=David<br />
| last4=Artigau | first4=Étienne | last5=Gagné | first5=Jonathan<br />
| last6=Baron | first6=Frédérique | last7=Riedel | first7=Adric<br />
| journal=The Astrophysical Journal<br />
| volume=762 | issue=2 | id=88 | pages=50 | date=January 2013<br />
| doi=10.1088/0004-637X/762/2/88 <br />
| bibcode=2013ApJ...762...88M<br />
| arxiv=1209.2077 | postscript=. }}</ref>。<br />
<br />
== 相關條目 ==<br />
* [[船帆座ο]]<br />
<br />
== 參考資料 ==<br />
{{reflist}}<br />
<br />
== 外部連結 ==<br />
* {{cite web|url=http://messier.seds.org/xtra/ngc/i2391.html|title=Omicron Velorum (IC 2391)|work=SEDS Messier Database|publisher=Students for the Exploration and Development of Space|author=Frommert, Harmut|date=29 March 1998|accessdate=2019-04-02|archive-date=2019-04-14|archive-url=https://web.archive.org/web/20190414232313/http://www.messier.seds.org/xtra/ngc/i2391.html|dead-url=no}}<br />
* {{wikiSky}}<br />
* {{cite simbad|title=IC 2391}}<br />
* {{cite web|url=http://www.atlasoftheuniverse.com/openclus.html|title=Open Cluster|work=An Atlas of The Universe|accessdate=2010-08-10|archive-date=2010-10-25|archive-url=https://web.archive.org/web/20101025185548/http://atlasoftheuniverse.com/openclus.html|dead-url=no}}<br />
<br />
{{sky|08|40|18|-|52|54|60|571}}<br />
<br />
{{科德韦尔天体}}<br />
<br />
{{DEFAULTSORT:Ic 2391}} <br />
[[Category:IC天體|2391]]<br />
[[Category:疏散星團]]<br />
[[Category:船帆座]]<br />
[[Category:科德韦尔天体|085b]]{{Caldwell catalogue}}<br />
[[Category:在中世紀發現的天體|64]]<br />
[[Category:10世紀的科學|64]]</div>
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