NGC 6553

NGC 6553
NGC 6553
	The globular cluster NGC 6553 imaged by the Hubble Space Telescope
觀測數據(J2000 曆元)
分類	V
星座	人馬座
赤經	18h 09m 15.68s
赤緯	-25° 54′ 27.9″
距離	19.6 kly; (6.01 kpc)
視星等 (V)	8.06
物理性質
金屬量	-0.18 dex
其它名稱	GCl 88, C 1806-259
	參見：球狀星團，球狀星團表

NGC 6553是人馬座的一個球狀星團。

NGC 6553的視星等約為8等，視直徑為8.2角分^[2]。NGC 6553的夏普力-索耶集中度分類法等級為XI^[2]，意味著恆星濃度即使在中心也非常鬆散；NGC 6553擁有亮度為20等或更暗的恆星。NGC 6553位於礁湖星雲東南方向略高於一度的位置。

NGC 6553相對富含金屬，與常見的球狀星團不同，並且有證據表明NGC 6553經歷過至少兩個恆星形成時期^[4]。由於恆星形成記錄複雜，星團中的恆星成分各不相同，最顯著的是鈉和鋁的濃度^[5]。

NGC 6553的成分與NGC 6528非常相似，顯示其起源於類似的環境^[6]。

參考資料

^ ^1.0 ^1.1 ^1.2 ^1.3 NGC 6553. SIMBAD. 斯特拉斯堡天文資料中心. [8 January 2017].
^ ^2.0 ^2.1 ^2.2 ^2.3 NGC 6553. [8 January 2016].
^ A Galactic Globular Clusters Database: NGC 6553. [8 January 2017].
^ Tang, Baitian; Cohen, Roger E.; Geisler, Doug; Schiavon, Ricardo P.; Majewski, Steven R.; Villanova, Sandro; Carrera, Ricardo; Zamora, Olga; Garcia-Hernandez, D. A.; Shetrone, Matthew; Frinchaboy, Peter; Meza, Andres; Fernández-Trincado, J. G.; Muñoz, Ricardo R.; Lin, Chien-Cheng; Lane, Richard R.; Nitschelm, Christian; Pan, Kaike; Bizyaev, Dmitry; Oravetz, Daniel; Simmons, Audrey, Two groups of red giants with distinct chemical abundances in the bulge globular cluster NGC 6553 through the eyes of APOGEE, Monthly Notices of the Royal Astronomical Society, 2016, 465: 19–31, arXiv:1610.06763 , doi:10.1093/mnras/stw2739 
^ Muñoz, C.; Villanova, S.; Geisler, D.; Cortés, C. C.; Moni Bidin, C.; Cohen, R. E.; Saviane, I.; Dias, B.; Tang, B.; Mauro, F., The vertical Na–O relation in the bulge globular cluster NGC 6553, Monthly Notices of the Royal Astronomical Society, 2019, 492 (3): 3742–3752, arXiv:1912.03742 , doi:10.1093/mnras/stz3586 
^ Muñoz, C.; Geisler, D.; Villanova, S.; Saviane, I.; Cortés, C. C.; Dias, B.; Cohen, R. E.; Mauro, F.; Moni Bidin, C., Chemical analysis of NGC 6528: One of the most metal-rich bulge globular clusters, Astronomy & Astrophysics, 2018, 620: A96, Bibcode:2018A&A...620A..96M, S2CID 119085692, arXiv:1809.04164 , doi:10.1051/0004-6361/201833373

外部連結

维基共享资源上的相關多媒體資源：NGC 6553
NGC 6553

[simbad-1] 1.0 ^1.1 ^1.2 ^1.3 NGC 6553. SIMBAD. 斯特拉斯堡天文資料中心. [8 January 2017].

[seds-2] 2.0 ^2.1 ^2.2 ^2.3 NGC 6553. [8 January 2016].

[altervista-3] A Galactic Globular Clusters Database: NGC 6553. [8 January 2017].

[4] Tang, Baitian; Cohen, Roger E.; Geisler, Doug; Schiavon, Ricardo P.; Majewski, Steven R.; Villanova, Sandro; Carrera, Ricardo; Zamora, Olga; Garcia-Hernandez, D. A.; Shetrone, Matthew; Frinchaboy, Peter; Meza, Andres; Fernández-Trincado, J. G.; Muñoz, Ricardo R.; Lin, Chien-Cheng; Lane, Richard R.; Nitschelm, Christian; Pan, Kaike; Bizyaev, Dmitry; Oravetz, Daniel; Simmons, Audrey, Two groups of red giants with distinct chemical abundances in the bulge globular cluster NGC 6553 through the eyes of APOGEE, Monthly Notices of the Royal Astronomical Society, 2016, 465: 19–31, arXiv:1610.06763 , doi:10.1093/mnras/stw2739 

[5] Muñoz, C.; Villanova, S.; Geisler, D.; Cortés, C. C.; Moni Bidin, C.; Cohen, R. E.; Saviane, I.; Dias, B.; Tang, B.; Mauro, F., The vertical Na–O relation in the bulge globular cluster NGC 6553, Monthly Notices of the Royal Astronomical Society, 2019, 492 (3): 3742–3752, arXiv:1912.03742 , doi:10.1093/mnras/stz3586 

[6] Muñoz, C.; Geisler, D.; Villanova, S.; Saviane, I.; Cortés, C. C.; Dias, B.; Cohen, R. E.; Mauro, F.; Moni Bidin, C., Chemical analysis of NGC 6528: One of the most metal-rich bulge globular clusters, Astronomy & Astrophysics, 2018, 620: A96, Bibcode:2018A&A...620A..96M, S2CID 119085692, arXiv:1809.04164 , doi:10.1051/0004-6361/201833373

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