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修正失效錨點

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{{Infobox cluster
| name = NGC 654
| image = NGC_654,VdB6,LDN_1332,1334,1337_(Cassiopeia).jpg
| caption = 在仙后座的NGC 654。
| credit = Antonio F. Sánchez
| type = [[疏散星團]]
| epoch = [[J2000.0|J2000]]
| constellation = [[仙后座]]
| ra = {{RA|01|44|00}}<ref name="simbad">
{{cite simbad
| title=NGC 654
| accessdate=2015-06-19
}}</ref>
| dec = {{DEC|+61|53|06}}<ref name="simbad"/>
| dist_ly = 7,830 [[光年|ly]]
| dist_pc = 2,400 [[秒差距|pc]]
| appmag_v = 6.5 <ref name="simbad"/>
| size_v = 5'
| mass_msol =
| age = 1,400萬年<ref>{{Cite web |url=https://www.univie.ac.at/webda/cgi-bin/ocl_page.cgi?dirname=ngc0654 |title=WEBDA: NGC 654 |accessdate=2020-10-18 |archive-date=2018-01-09 |archive-url=https://web.archive.org/web/20180109205730/http://www.univie.ac.at/webda/cgi-bin/ocl_page.cgi?dirname=ngc0654 |dead-url=no }}</ref>
| notes =
| names = [[科林德目錄|Cr]] 18
}}

'''NGC 654'''位於[[仙后座]]，是[[威廉·赫歇爾]]在1787年發現的一個[[疏散星團]]。它的[[視星等]]為6.5等，使用[[雙筒望遠鏡]]就能觀測<ref>{{cite book|last1=Stephen James O'Meara|title=Deep-Sky Companions: The Secret Deep vol. 4|date=2011|publisher=[[Cambridge University Press]]|isbn=978-1-139-50007-4|pages=31–33|url=https://books.google.com/books?id=v859bKO0A4gC&pg=PA31|ref=O'Meara|access-date=2020-10-18|archive-date=2021-07-31|archive-url=https://web.archive.org/web/20210731030656/https://books.google.com/books?id=v859bKO0A4gC&pg=PA31}}</ref>。它位於[[閣道三]]（仙后座δ）東北2. 5°。在低倍數的視野中，同時也可以看見另外兩個疏散星團[[NGC 663]]和[[NGC 659]]。它環繞著一顆視星等7等的淡黃色[[超巨星]]（光譜類型為F5Ia），可能是這個星團的成員之一<ref>{{cite journal|author1=Huestamendia, G.|author2=del Rio, G.|author3=Mermilliod, J.-C.|title=UBV photometry of open clusters in the Cassiopeia region. II - Photoelectric observations of NGC 654|journal=Astronomy and Astrophysics Supplement Series|date=July 1993|volume=100|issue=1|pages=25–32|url=http://cdsads.u-strasbg.fr/abs/1993A%26AS..100...25H|accessdate=29 December 2015|bibcode=1993A&AS..100...25H|archive-date=2019-08-20|archive-url=https://web.archive.org/web/20190820041440/http://cdsads.u-strasbg.fr/abs/1993A%26AS..100...25H|dead-url=no}}</ref>。

它距離地球7,830光年（2,400秒差距）。估計他的年齡為1,500萬年，是個非常年輕的星團；但也可能有4,000萬年的歷史，恆星形成的時間間隔至少為20萬年。星團的中心區域顯示出比星團其他部分更少的紅化<ref>{{cite journal |author1=A. K. Pandey |author2=K. Upadhyay |author3=K. Ogura |author4=Ram Sagar |author5=V. Mohan |author6=H. Mito |author7=H. C. Bhatt |author8=B. C. Bhatt |title=Stellar contents of two young open clusters: NGC 663 and 654 |journal=MNRAS |date=April 2005 |volume=358 |issue=4 |pages=1290–1308 |doi=10.1111/j.1365-2966.2005.08784.x |url=http://mnras.oxfordjournals.org/content/358/4/1290.full |bibcode=2005MNRAS.358.1290P |doi-access=free |access-date=2020-10-18 |archive-date=2014-06-24 |archive-url=https://web.archive.org/web/20140624013939/http://mnras.oxfordjournals.org/content/358/4/1290.full |dead-url=no }}</ref>。給出的一種可能解釋是，在太陽系和星團之間有兩個塵埃層，一個在200秒差距之處，另一個在1,000秒差距<ref>{{cite journal|author1=Biman J. Medhi |author2=Maheswar G. |author3=J. C. Pandey |author4=T. S. Kumar |author5=Ram Sagar |title=Optical polarimetric study of open clusters: distribution of interstellar matter towards NGC 654|journal=MNRAS|date=2008|volume=388|issue=1|pages=105–116|doi=10.1111/j.1365-2966.2008.13405.x|url=http://mnras.oxfordjournals.org/content/388/1/105|accessdate=29 December 2015|arxiv = 0804.4739 |bibcode = 2008MNRAS.388..105M }}</ref>。在星團的後面還有更多的塵埃層，星團的成員約有80顆恆星。成員中最早的光譜類型為B0左右，也有一些較亮的恆星，例如光譜類型為F5Ia的HD 10494。此外，在星團中還發顯了3顆[[Be星]]<ref>{{cite journal|last1=H.M. Shi - J.Y. Hu|title=Spectroscopic observations of young open clusters: IC 1805, NGC 654 and NGC 6823|journal=Astron. Astrophys. Suppl. Ser.|date=April 1999|volume=136|issue=2|pages=313–331|doi=10.1051/aas:1999217|url=http://aas.aanda.org/articles/aas/pdf/1999/08/ds8200.pdf|accessdate=29 December 2015|bibcode=1999A&AS..136..313S|archive-date=2017-08-09|archive-url=https://web.archive.org/web/20170809140709/https://aas.aanda.org/articles/aas/pdf/1999/08/ds8200.pdf|dead-url=no}}</ref>。

NGC 654被認為是仙后座OB8[[星協]]的一部分。這個星協位於[[銀河系]]的[[英仙臂]]，包括[[M103 (星團)|M103]]、[[NGC 663]]、[[NGC 659]]以及散佈在它們之間的一些[[超巨星]]。所有這些恆星的年齡和距離都相似<ref name="aaa528">{{cite journal
| author=Negueruela, I.
| author2=González-Fernández, C.
| author3=Marco, A.
| author4=Clark, J. S.
| title=A massive association around the obscured open cluster RSGC3
| journal=Astronomy & Astrophysics
| volume=528
| pages=A59
| date=2011
| doi=10.1051/0004-6361/201016102
| bibcode=2011A&A...528A..59N|arxiv = 1102.0028 }}</ref><ref name="ApJS1978">{{cite journal
| author=Humphreys, R. M.
| title=Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way.
| journal=Astrophysical Journal Supplement Series
| volume=38
| pages=309–350 | date=1978
| doi=10.1086/190559
| bibcode=1978ApJS...38..309H}}</ref>。

== 圖集 ==
{{Gallery|width=200
|File:NGC654-Rev.01-THIS IS FINAL.jpg|NGC 654 - by Kanwar Singh
|File:NGC 654 map.png|Map showing location of NGC 654
}}

== 參考資料 ==
{{Reflist|30em}}

== 外部連結 ==
{{commonscat}}
* {{WikiSky}}

{{Sky|01|44|00|+|61|53|6}}

{{DEFAULTSORT:NGC 0654}}
[[Category:疏散星團]]
[[Category:仙后座]]
[[Category:NGC天體|0654]]
[[Category:1787年發現的天體]]

NGC 654 - 版本历史

imported>Adachan06：​修正失效錨點

imported>Adachan06：修正失效錨點