View source for NGC 4833

{{Short description|Globular cluster in the constellation Musca}}
{{Infobox globular cluster
 | name             = NGC 4833
 | image            = [[File:A sky full of stars NGC 4833.jpg|300px]] 
 | caption          = NGC 4833 is one of the over 150 globular clusters known to reside within the Milky Way.<ref name="hstimage"/>
 | credit           = 
 | epoch            = [[J2000]]
 | class            = VIII<ref name=hcob849_11/>
 | constellation    = [[Musca]]
 | ra               = {{RA|12|59|33.92}}<ref name=aj140_6_1830/>
 | dec              = {{DEC|–70|52|35.4}}<ref name=aj140_6_1830/>
 | dist_ly          = {{cvt|21.5|kly|kpc|lk=on}}<ref name=apj742_1_51/>
 | dist_pc          = 
 | appmag_v         = +7.79<ref name="simbad" />
 | size_v           = {{val|13.5|ul=arcminute}}<ref name=O'Meara_2016/>
 | absmag_v         = −8.16<ref name=Carretta_et_al_2014/>
 | mass_msol        = {{Val|4.10|e=5}}<ref name=apj742_1_51/>
 | mass_kg          = 
 | radius_arcminsec = 
 | radius_ly        = 42&nbsp;ly<ref>distance × tan( diameter_angle / 2 ) = 42 ly. radius</ref>
 | radius_pc        = 
 | radius_tidal_arcminsec = 
 | radius_tidal_ly  = 
 | radius_tidal_pc  = 
 | v_hb             = 
 | metal_fe         = –2.02<ref name=Carretta_et_al_2014/>
 | metal_z          = 
 | age              = 12.54&nbsp;[[Gigayear|Gyr]]<ref name=mnras404_3_1203/>
 | notes            = 
 | names            = [[New General Catalogue|NGC]]&nbsp;4833, [[Caldwell catalogue|Caldwell]]&nbsp;105, GCl&nbsp;21,<ref name="simbad" /> Lacaille&nbsp;I.4, Dunlop&nbsp;164, Bennett&nbsp;56
}}

[[File:NGC4833Location.png|thumb|left|The location of NGC 4833 (labelled in red)]]
'''NGC 4833''' is a [[globular cluster]] discovered by [[Nicolas Louis de Lacaille|Abbe Lacaille]] during his 1751-1752 journey to South Africa, and catalogued in 1755.<ref name=Jones_1969/> It was subsequently observed and catalogued by [[James Dunlop]] and [[John Herschel|Sir John Herschel]] whose instruments could resolve it into individual stars.<ref name=O'Meara_2016/>

The globular cluster is situated in the very southerly constellation [[Musca]]<ref name=O'Meara_2016/> at a distance of 21,500 [[light year]]s from Earth.<ref name=apj742_1_51/> It is located near the [[Coalsack Nebula]] and is partially obscured by this dusty region of the galactic plane.<ref name=Carretta_et_al_2014/> After corrections for the [[interstellar reddening|reddening]] by dust, evidence was obtained that it is in the order of 2 billion years older than globular clusters [[Messier 5|M5]] or [[Messier 92|M92]].<ref name=Melbourne_et_al_2000/>

This is a massive, [[metallicity|metal]]-poor globular cluster that shows evidence for multiple generations of stars.<ref name=Carretta_2021/> It is an old halo cluster of the [[Oosterhoff type I|Oosterhoff type II]]. The orbit of the cluster through the galaxy is very eccentric, with an [[orbital eccentricity|eccentricity]] of 0.84 that carries it close to the [[Galactic Center]]. The cluster has likely lost a significant portion of its original mass due to interactions with the galactic bulge.<ref name=Carretta_et_al_2014/>

A 2012 survey for [[variable star]]s identified six [[SX Phoenicis variable|SX Phe]], two [[Eclipsing binary|eclipsing binaries]] (including a [[W Ursae Majoris variable|W UMa]]), and 19 [[RR Lyrae variable|RR Lyr]] variables.<ref name=Darragh_Murphy_2012/><ref name=Demers_Wehlau_1977/>

{{Clear|left}}
==See also==
* [[New General Catalogue]]

==References==
{{reflist|refs=

<ref name=Jones_1969>{{citation | postscript=.
 | title=The search for the nebulae - VI
 | last=Jones | first=K. G.
 | journal=Journal of the British Astronomical Association
 | volume=79 | pages=213–222 | date=March 1969
 | bibcode=1969JBAA...79..213J }}</ref>

<ref name=hcob849_11>{{citation | postscript=.
 | title=A Classification of Globular Clusters
 | last1=Shapley | first1=Harlow | author1-link=Harlow Shapley
 | last2=Sawyer | first2=Helen B. | author2-link=Helen Sawyer Hogg
 | journal=Harvard College Observatory Bulletin
 | volume=849 | issue=849 | pages=11–14 |date=August 1927
 | bibcode=1927BHarO.849...11S }}</ref>

<ref name=aj140_6_1830>{{citation | postscript=.
 | title=The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters
 | 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
 | display-authors=1 | journal=The Astronomical Journal
 | volume=140 | issue=6 | pages=1830–1837 | date=December 2010
 | doi=10.1088/0004-6256/140/6/1830 | arxiv=1008.2755
 | bibcode=2010AJ....140.1830G | s2cid=119183070 }}</ref>

<ref name=mnras404_3_1203>{{citation | postscript=.
 | title=Accreted versus in situ Milky Way globular clusters
 | last1=Forbes | first1=Duncan A. | last2=Bridges | first2=Terry
 | journal=[[Monthly Notices of the Royal Astronomical Society]]
 | volume=404 | issue=3 | pages=1203–1214 | date=May 2010
 | doi=10.1111/j.1365-2966.2010.16373.x | doi-access=free
 | bibcode=2010MNRAS.404.1203F | arxiv=1001.4289 | s2cid=51825384 }}</ref>

<ref name="simbad">{{cite simbad | title=NGC 4833 | access-date=2006-11-17 }}</ref>

<ref name=apj742_1_51>{{citation | postscript=.
 | title=Young Radio Pulsars in Galactic Globular Clusters
 | last1=Boyles | first1=J. | last2=Lorimer | first2=D. R.
 | last3=Turk | first3=P. J. | last4=Mnatsakanov | first4=R.
 | last5=Lynch | first5=R. S. | last6=Ransom | first6=S. M.
 | last7=Freire | first7=P. C. | last8=Belczynski | first8=K.
 | display-authors=1 | journal=The Astrophysical Journal
 | volume=742 | issue=1 | page=51 | date=November 2011
 | doi=10.1088/0004-637X/742/1/51 | arxiv=1108.4402
 | bibcode=2011ApJ...742...51B | s2cid=118649860 }}</ref>

<ref name="hstimage">{{citation | postscript=.
 | title=A sky full of stars
 | website=www.spacetelescope.org
 | url=http://www.spacetelescope.org/images/potw1631a/
 | access-date=1 August 2016 }}</ref>

<ref name=O'Meara_2016>{{citation | postscript=.
 | title=Deep-Sky Companions: The Caldwell Objects
 | first=Stephen James | last=O'Meara
 | year=2016 | pages=480–482
 | isbn=9781316033531
 | publisher=Cambridge University Press
 | url=https://books.google.com/books?id=evkODQAAQBAJ&pg=PA480 }}</ref>

<ref name=Carretta_et_al_2014>{{citation | postscript=.
 | title=The extreme chemistry of multiple stellar populations in the metal-poor globular cluster NGC 4833
 | last1=Carretta | first1=E. | last2=Bragaglia | first2=A.
 | last3=Gratton | first3=R. G. | last4=D'Orazi | first4=V.
 | last5=Lucatello | first5=S. | last6=Momany | first6=Y.
 | last7=Sollima | first7=A. | last8=Bellazzini | first8=M.
 | last9=Catanzaro | first9=G. | last10=Leone | first10=F.
 | display-authors=1 | journal=Astronomy & Astrophysics
 | volume=564 | at=id. A60 | date=April 2014
 | doi=10.1051/0004-6361/201323321 
 | arxiv=1401.7325 | bibcode=2014A&A...564A..60C }}</ref>

<ref name=Carretta_2021>{{citation | postscript=.
 | title=Potassium abundances in multiple stellar populations of the globular cluster NGC 4833
 | last=Carretta | first=Eugenio
 | journal=Astronomy & Astrophysics
 | volume=649 | at=id. A154 | date=May 2021
 | doi=10.1051/0004-6361/202140684 
 | arxiv=2103.10441 | bibcode=2021A&A...649A.154C }}</ref>

<ref name=Darragh_Murphy_2012>{{citation | postscript=.
 | title=New SX Phoenicis Variables in the Globular Cluster NGC 4833
 | last1=Darragh | first1=A. N. | last2=Murphy | first2=B. W.
 | journal=Journal of the Southeastern Association for Research in Astronomy
 | volume=6 | pages=72–77 | date=July 2012
 | arxiv=1205.1025 | bibcode=2012JSARA...6...72D }}</ref>

<ref name=Demers_Wehlau_1977>{{citation | postscript=.
 | title=Variable stars of NGC 4833
 | last1=Demers | first1=S. | last2=Wehlau | first2=A.
 | journal=Astronomical Journal
 | volume=82 | pages=620–625 | date=August 1977
 | doi=10.1086/112095 | bibcode=1977AJ.....82..620D }}</ref>

<ref name=Melbourne_et_al_2000>{{citation | postscript=.
 | title=CCD Photometry of the Globular Cluster NGC 4833 and Extinction Near the Galactic Plane
 | last1=Melbourne | first1=Jason | last2=Sarajedini | first2=Ata
 | last3=Layden | first3=Andrew | last4=Martins | first4=Donald H.
 | display-authors=1 | journal=The Astronomical Journal
 | volume=120 | issue=6 | pages=3127–3138 | date=December 2000
 | doi=10.1086/316869 
 | arxiv=astro-ph/0009401 | bibcode=2000AJ....120.3127M }}</ref>

}}

==Further reading==
{{Div col|small=yes}}
*{{citation | postscript=.
 | title=Detailed abundances of 15 stars in the metal-poor globular cluster NGC 4833
 | last1=Roederer | first1=Ian U. | last2=Thompson | first2=Ian B.
 | journal=Monthly Notices of the Royal Astronomical Society
 | volume=449 | issue=4 | pages=3889–3910 | date=June 2015
 | doi=10.1093/mnras/stv546 
 | doi-access=free
 | arxiv=1503.03079 | bibcode=2015MNRAS.449.3889R }}
*{{citation | postscript=.
 | contribution=Wide-field variability survey of the globular cluster NGC 4833
 | last=Kopacki | first=Grzegorz
 | title=Precision Asteroseismology, Proceedings of the International Astronomical Union, IAU Symposium
 | volume=301 | pages=441–442 | date=February 2014
 | doi=10.1017/S1743921313014956 
 | arxiv=1401.4822 | bibcode=2014IAUS..301..441K }}
*{{citation | postscript=.
 | title=A new photographic C-M diagram for NGC 4833.
 | display-authors=1 | last1=Samus | first1=N.
 | last2=Kravtsov | first2=V. | last3=Pavlov | first3=M.
 | last4=Alcaino | first4=G. | last5=Liller | first5=W.
 | journal=Astronomy and Astrophysics Supplement
 | volume=109 | pages=479–486 | date=March 1995
 | bibcode=1995A&AS..109..479S }}
*{{citation | postscript=.
 | title=Eleven variable stars in the globular cluster NGC 4833
 | last=Wright | first=Frances W. | author-link=Frances Woodworth Wright
 | journal=Publications of the American Astronomical Society
 | volume=10 | year=1946 | page=264
 | editor-first=Dean B. | editor-last= McLaughlin
 | publisher=Published by the AAS
 | bibcode=1946PAAS...10..264W }}
{{Div col end}}

==External links==
{{commonscat}}
* [http://messier.seds.org/xtra/ngc/n4833.html Basic information and data]
* [http://www.astrosurf.com/antilhue/ngc4833.htm Photographed by the Antilhue amateur astronomical observatory]
* [https://arxiv.org/abs/astro-ph/0009401 CCD Photometry of the Globular Cluster NGC 4833 and Extinction Near the Galactic Plane]
* [https://web.archive.org/web/20050322092632/http://ourworld.compuserve.com/homepages/silmerina/musglobs.htm Position relative to nearby cluster NGC 4372]
* {{WikiSky}}

{{Sky|12|59|34.98|-|70|52|28.6|21200}}
{{Catalogs|C=105|NGC=4833}}
{{Musca}}
{{Caldwell catalogue}}
{{Ngc50}}

{{DEFAULTSORT:NGC 4833}}
[[Category:Globular clusters]]
[[Category:NGC objects|4833]]
[[Category:Musca]]
[[Category:Caldwell objects|105b]]