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Sh2-308 - 版本历史
2026-07-17T23:18:22Z
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2023-11-15T01:47:36Z
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<p><b>新页面</b></p><div>{{Infobox nebula<br />
|name=Sh2-308<br />
|image=Dolphin Head Nebula - Lucky Budd - Jan 2022.tif<br />
|type=emission<br />
|class=3 2 2<br />
|epoch=J2000.0<br />
|ra=06<sup>h</sup> 54<sup>m</sup> 13<sup>s</sup><br />
|dec=−23° 55′ 42″<br />
|dist_ly=4530<br />
|appmag_v=7.0<br />
|size_v=35′×35′<br />
|constellation=[[大犬座]]<br />
|radius_ly=30<br />
|absmag_v=<br />
|names=Sh-308, [[RCW星表|RCW]] 11, [[林德亮星雲表|LBN]] 1052 }}<br />
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'''Sh2-308'''（也稱為'''RCW 11'''、'''LBN 1052'''<ref>{{cite simbad |title=Sh 2-308 |accessdate=2017-04-30}}</ref>或'''海豚星雲'''）是一個[[發射星雲]]，位於[[大犬座]]中心附近的H II區域，由電離[[氫]]組成<ref name=":0">{{Cite web|url=https://www.spacetelescope.org/images/potw1721a/|title=Inflating Sh2-308|website=www.spacetelescope.org|language=English|access-date=2017-05-22|archive-date=2017-05-22|archive-url=https://web.archive.org/web/20170522144305/https://www.spacetelescope.org/images/potw1721a/|dead-url=no}}</ref>。它位於夜空中最亮的恆星[[天狼星]]以南約8度處。 該星雲呈氣泡狀，圍繞著一顆名為[[大犬座EZ]]的[[沃爾夫-拉葉星]]，這顆[[恆星]]正處於演化中前[[超新星]]階段。該星雲距地球約4,530[[光年]]（1,389[[秒差距]]）<ref>{{Cite journal|last=van Leeuwen|first=F.|date=2007-11-01|title=Validation of the new Hipparcos reduction|bibcode=2007A&A...474..653V|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|doi=10.1051/0004-6361:20078357|issn=0004-6361|arxiv = 0708.1752 |s2cid=18759600}}</ref>，但一些研究表明恆星和星雲的距離均達5,870光年（1,800秒差距）<ref>{{Cite web|url=https://apod.nasa.gov/apod/ap090423.html|title=APOD: 2009 April 23 - Sharpless 308|website=apod.nasa.gov|access-date=2017-05-02|archive-date=2009-04-10|archive-url=https://web.archive.org/web/20090410024808/https://apod.nasa.gov/apod/ap090423.html|dead-url=no}}</ref><ref>{{cite arXiv|last1=Morris|first1=P W|last2=Crowther|first2=P A|last3=Houck|first3=J R|date=2004-06-01|title=Spitzer-IRS Sectroscopy of the Prototype Wolf–Rayet star EZ CMa (HD 50896)|eprint=astro-ph/0406074}}</ref>。還有人指出該星雲距離[[地球]]只有1,875光年(575秒差距)<ref name="ras">{{Cite journal|last1=Burningham|first1=Ben|last2=Naylor|first2=Tim|last3=Jeffries|first3=R. D.|last4=Devey|first4=C. R.|date=2003-12-01|title=On the nature of Collinder 121: insights from the low-mass pre-main sequence|bibcode=2003MNRAS.346.1143B|journal=Monthly Notices of the Royal Astronomical Society|volume=346|issue=4|pages=1143–1150|doi=10.1111/j.1365-2966.2003.07160.x|issn=0035-8711|arxiv = astro-ph/0308488 |s2cid=16366019}}</ref>。<br />
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== 參考資料 ==<br />
{{reflist}}<br />
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{{Sh2 objects}}<br />
{{RCW}}<br />
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[[Category:大犬座]]<br />
[[Category:沙普利斯天體]]</div>
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