NGC 4833 is aglobular cluster discovered byAbbe Lacaille during his 1751-1752 journey to South Africa, and catalogued in 1755.[10] It was subsequently observed and catalogued byJames Dunlop andSir John Herschel whose instruments could resolve it into individual stars.[6]
The globular cluster is situated in the very southerly constellationMusca[6] at a distance of 21,500light years from Earth.[4] It is located near theCoalsack Nebula and is partially obscured by this dusty region of the galactic plane.[7] After corrections for thereddening by dust, evidence was obtained that it is in the order of 2 billion years older than globular clustersM5 orM92.[11]
This is a massive,metal-poor globular cluster that shows evidence for multiple generations of stars.[12] It is an old halo cluster of theOosterhoff type II. The orbit of the cluster through the galaxy is very eccentric, with aneccentricity of 0.84 that carries it close to theGalactic Center. The cluster has likely lost a significant portion of its original mass due to interactions with the galactic bulge.[7]
^Darragh, A. N.; Murphy, B. W. (July 2012), "New SX Phoenicis Variables in the Globular Cluster NGC 4833",Journal of the Southeastern Association for Research in Astronomy,6:72–77,arXiv:1205.1025,Bibcode:2012JSARA...6...72D.
Roederer, Ian U.; Thompson, Ian B. (June 2015), "Detailed abundances of 15 stars in the metal-poor globular cluster NGC 4833",Monthly Notices of the Royal Astronomical Society,449 (4):3889–3910,arXiv:1503.03079,Bibcode:2015MNRAS.449.3889R,doi:10.1093/mnras/stv546.
Kopacki, Grzegorz (February 2014), "Wide-field variability survey of the globular cluster NGC 4833",Precision Asteroseismology, Proceedings of the International Astronomical Union, IAU Symposium, vol. 301, pp. 441–442,arXiv:1401.4822,Bibcode:2014IAUS..301..441K,doi:10.1017/S1743921313014956.
Samus, N.; et al. (March 1995), "A new photographic C-M diagram for NGC 4833.",Astronomy and Astrophysics Supplement,109:479–486,Bibcode:1995A&AS..109..479S.
Wright, Frances W. (1946), McLaughlin, Dean B. (ed.), "Eleven variable stars in the globular cluster NGC 4833",Publications of the American Astronomical Society,10, Published by the AAS: 264,Bibcode:1946PAAS...10..264W.
