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{{Infobox globular cluster
| name = NGC 6441
| image = [[File:NGC 6441 HST 10775 R814B606.png|300px]]
| caption =
| credit =
| epoch = [[J2000]]
| class =
| constellation = [[天蝎座]]
| ra = {{RA|17|50|13.06}}<ref name=aj140_6_1830/>
| dec = {{DEC|−37|03|05.2}}<ref name=aj140_6_1830/>
| dist_ly = {{Convert|13.5|kpc|kly|abbr=on|lk=on|order=flip}}<ref name=apj675_1_670/>
| appmag_v = 7.2<ref name=omeara2013/>
| size_v = 9.6′<ref name=omeara2013/>
| mass_msol = {{Val|1.6e6}}<ref name=apj765_1_32/>
| mass_kg =
| radius_arcminsec = 4.8<ref name=apj675_1_670/>
| radius_ly =
| radius_pc =
| radius_tidal_arcminsec =
| radius_tidal_ly = {{Convert|27.23|pc|ly|abbr=on|lk=off|order=flip}}<ref name=mnras360_2_631/>
| v_hb =
| metal_fe = −0.53<ref name=aj144_6_183/>
| age = 13−13.7<ref name=apj675_1_670/> Gyr
| notes =
| names =
}}

'''NGC 6441'''位於南天的[[天蝎座]]，是登錄在[[NGC天體表]]內的一個[[球狀星團]]。它是蘇格蘭的天文學家[[詹姆士·敦洛普]]在1826年5月13日發現的。根據敦洛普的描述，這是一個小，但有明確界線的明亮星雲，直徑大約20″。這個星團位於[[傅說 (恆星)]]（天蝎座 G）東北東方5[[弧分]]<ref name=omeara2013/>，與太陽相距約44,000[[光年]] <ref name=apj675_1_670/>。

這是銀河系中最大和最明亮的球狀星團之一，估計質量是160萬倍[[太陽質量]]。它位於銀河系的[[核球 (星系)|核球]]，距離[[銀心]]約{{Convert|3.9|kpc|kly|abbr=on|link=off|order=flip}}<ref name=mnras360_2_631/>，被認為是富[[金屬量]]。也就是相對之下有較多高於氦元素的金屬元素豐度<ref name=apj765_1_32/>。相較於0.64弧分的半質量半徑，星團的核心區域大約是0.11[[弧分]]。在核心區域的恆星密度暗示它的亮度密度是{{nowrap|5.25 [[太陽光度|L<sub>⊙</sub>]] pc<sup>−3</sup>}}<ref name=apj675_1_670/>。星團的半光度半徑是{{Convert|2.18|pc|ly|abbr=on|lk=off|order=flip}}<ref name=mnras360_2_631/>。

這個星團有異常大量的[[天琴座RR變星]]，在2006年時有68顆候選者，並且週期長於各自[[金屬量|金屬豐度範圍]]的典型（星團的RRab星的平均週期是0.759天）。它也有幾顆[[第二型造父變星]]，在這個星團內有不尋常的高金屬量<ref name=aj132_3_1014/>。在[[赫羅圖|顏色-星等圖]]的[[紅巨星分支]]章節解釋，星團中至少有兩種，並可能有三種不同的星族。最亮和較高溫的[[紅群聚]]星族集中在星團的中心。這個集團可能是富含氦的第二族恆星<ref name=ajl767_2_L27/>。

這個星團內至少有4顆[[毫秒脈衝星]]，且其中兩顆是在[[聯星|聯星系]]。其中一顆是軌道[[離心率]]高達0.71的聯星PSR J1750−37A<ref name=apj675_1_670/>。這個星團有一顆[[X射線爆發源]]，X1746-370，它有著在所有的球狀團和星系中已知最長的週期<ref name=aj123_6_3255/>。最後，這而還有一個[[行星狀星雲]]，JaFu 2<ref name=aj114_2611/>，是在銀河系內已知有行星狀星雲的4個球狀星團之一<ref name=omeara2013/>。

== 參考資料 ==
{{reflist|refs=

<ref name=aj140_6_1830>{{citation
| display-authors=1
| last1=Goldsbury | first1=Ryan | last2=Richer | first2=Harvey B.
| last3=Anderson | first3=Jay | last4=Dotter | first4=Aaron
| last5=Sarajedini | first5=Ata | last6=Woodley | first6=Kristin
| title=The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters
| journal=The Astronomical Journal
| volume=140 | issue=6 | pages=1830–1837 |date=December 2010
| doi=10.1088/0004-6256/140/6/1830 | bibcode=2010AJ....140.1830G
| postscript=. | arxiv=1008.2755
}}</ref>

<ref name=aj114_2611>{{citation
| display-authors=1 | last1=Jacoby | first1=George H.
| last2=Morse | first2=Jon A. | last3=Fullton | first3=L. Kellar
| last4=Kwitter | first4=K. B. | last5=Henry | first5=R. B. C.
| title=Planetary Nebulae in the Globular Cluster PAL 6 and NGC 6441
| journal=Astronomical Journal
| volume=114 | page=2611 | date=December 1997
| doi=10.1086/118671 | bibcode=1997AJ....114.2611J
| postscript=.
}}</ref>

<ref name=ajl767_2_L27>{{citation
| display-authors=1 | last1=Krogsrud | first1=David A.
| last2=Sandquist | first2=Eric L. | last3=Kato | first3=Tadafumi
| title=The Curious Radial Distributions of Horizontal Branch Stars in NGC 6441
| journal=The Astrophysical Journal Letters
| volume=767 | issue=2 | id=L27 | pages=5 | date=April 2013
| doi=10.1088/2041-8205/767/2/L27 | bibcode=2013ApJ...767L..27K
| arxiv=1304.1470 | postscript=.
}}</ref>

<ref name=aj144_6_183>{{citation
| last1=Leaman | first1=Ryan
| title=Insights into Pre-enrichment of Star Clusters and Self-enrichment of Dwarf Galaxies from Their Intrinsic Metallicity Dispersions
| journal=The Astronomical Journal
| volume=144 | issue=6 | id=183 | pages=13
| date=December 2012
| doi=10.1088/0004-6256/144/6/183
| bibcode=2012AJ....144..183L
| postscript=. | arxiv=1209.4648
}}</ref>

<ref name=apj765_1_32>{{citation
| display-authors=1 | last1=Bellini | first1=A.
| last2=Piotto | first2=G. | last3=Milone | first3=A. P.
| last4=King | first4=I. R. | last5=Renzini | first5=A.
| last6=Cassisi | first6=S. | last7=Anderson | first7=J.
| last8=Bedin | first8=L. R. | last9=Nardiello | first9=D.
| last10=Pietrinferni | first10=A. | last11=Sarajedini | first11=A.
| title=The Intriguing Stellar Populations in the Globular Clusters NGC 6388 and NGC 6441
| journal=The Astrophysical Journal
| volume=765 | issue=1 | id=32 | pages=27 | date=March 2013
| doi=10.1088/0004-637X/765/1/32 | bibcode=2013ApJ...765...32B
| arxiv=1301.2822 | postscript=.
}}</ref>

<ref name=apj675_1_670>{{citation
| display-authors=1 | last1=Freire | first1=Paulo C. C.
| last2=Ransom | first2=Scott M. | last3=Bégin | first3=Steve
| last4=Stairs | first4=Ingrid H. | last5=Hessels | first5=Jason W. T.
| last6=Frey | first6=Lucille H. | last7=Camilo | first7=Fernando
| title=Eight New Millisecond Pulsars in NGC 6440 and NGC 6441
| journal=The Astrophysical Journal
| volume=675 | issue=1 | pages=670−682 | date=March 2008
| doi=10.1086/526338 | bibcode=2008ApJ...675..670F
| arxiv=0711.0925 | postscript=.
}}</ref>

<ref name=aj132_3_1014>{{citation
| display-authors=1 | last1=Corwin | first1=T. Michael
| last2=Sumerel | first2=Andrew N. | last3=Pritzl | first3=Barton J.
| last4=Smith | first4=Horace A. | last5=Catelan | first5=M.
| last6=Sweigart | first6=Allen V. | last7=Stetson | first7=Peter B.
| title=Image-Subtraction Photometry of Variable Stars in the Globular Clusters NGC 6388 and NGC 6441
| journal=The Astronomical Journal
| volume=132 | issue=3 | pages=1014−1022 | date=September 2006
| doi=10.1086/505745 | bibcode=2006AJ....132.1014C
| arxiv=astro-ph/0605569 | postscript=.
}}</ref>

<ref name=aj123_6_3255>{{citation
| display-authors=1 | last1=Homer | first1=L.
| last2=Anderson | first2=Scott F. | last3=Margon | first3=Bruce
| last4=Downes | first4=Ronald A. | last5=Deutsch | first5=Eric W.
| title=Optical Identification of the X-Ray Burster X1746-370 in the Globular Cluster NGC 6441
| journal=The Astronomical Journal
| volume=123 | issue=6 | pages=3255−3262 | date=June 2002
| doi=10.1086/340470 | bibcode=2002AJ....123.3255H
| arxiv=astro-ph/0201550 | postscript=.
}}</ref>

<ref name=mnras360_2_631>{{citation
| last1=Mackey | first1=A. D.
| last2=van den Bergh | first2=Sidney
| title=The properties of Galactic globular cluster subsystems
| journal=Monthly Notices of the Royal Astronomical Society
| volume=360 | issue=2 | pages=631−645 | date=June 2005
| doi=10.1111/j.1365-2966.2005.09080.x | bibcode=2005MNRAS.360..631M
| arxiv=astro-ph/0504142 | postscript=.
}}</ref>

<ref name=omeara2013>{{citation
| first1=Stephen James
| last1=O'Meara
| title=Deep-Sky Companions: Southern Gems
| publisher=Cambridge University Press
| year=2013
| isbn=1139851543
| pages=360−363
| url=https://books.google.com/books?id=BoIsCgAAQBAJ&pg=PA360
| accessdate=2016-09-16
| archive-date=2016-05-03
| archive-url=https://web.archive.org/web/20160503092926/https://books.google.com/books?id=BoIsCgAAQBAJ&pg=PA360
| dead-url=no
}}</ref>

}}
{{Ngc65|state=collapsed}}
[[Category:球狀星團|NGC 6441]]
[[Category:天蝎座|NGC 6441]]
[[Category:NGC天體|6441]]
[[Category:1826年發現的天體|18260513]]

NGC 6441 - 版本历史

imported>InternetArchiveBot：​补救1个来源，并将0个来源标记为失效。) #IABot (v2.0.8

imported>InternetArchiveBot：补救1个来源，并将0个来源标记为失效。) #IABot (v2.0.8