泰爾讓7是鬆散和年輕的球狀星團,被認為起源於人馬座矮椭球星系(Sag DEG)並與之有物理上的關聯。相較之下它是富金屬,它的金屬量是[Fe/H] = -0.6[6],並且估計年齡是75億歲[4]。泰爾讓7有少量的鎳([Ni/Fe]=-0.2),因為有著相似的化學特徵,這支持它是人馬座矮椭球星系的成員[7]。它有豐富的藍掉隊星,並且強烈的朝向中心集中[8]。它的平均亮度分佈在Mv = -5.05.[9]。它的半光度半徑(Rh)= 6.5秒差距[10]。
事实速览 泰爾讓7, 觀測數據(J2000 曆元) ...
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泰爾讓7是法國天文學家阿戈普·泰爾讓在1968年發現的[11]最亮的[12]六個球狀星團之一[12]。
幾乎所有的銀河系的银晕的球狀星團是同時形成(12-15 Gyr)。 即使是位於遠處的NGC 2419(距離銀河中心約100 kpc)也有相似的年齡。這種趨勢也適用於大麦哲伦星系和天爐座矮星系(來自銀河中心的約140 kpc)發現的球狀團的年齡。
- ^ 75.7 kly × tan( 7′.3 / 2 ) = 160 ly. radius
Geisler, Doug; Wallerstein, George; Smith, Verne V.; Casetti-Dinescu, Dana I., Chemical Abundances and Kinematics in Globular Clusters and Local Group Dwarf Galaxies and Their Implications for Formation Theories of the Galactic Halo, The Publications of the Astronomical Society of the Pacific, September 2007, 119 (859): 939–961, Bibcode:2007PASP..119..939G, arXiv:0708.0570
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Sbordone, L.; Bonifacio, P.; Marconi, G.; Buonanno, R.; Zaggia, S., Family ties: Abundances in Terzan 7, a Sgr dSph globular cluster, Astronomy and Astrophysics, July 3, 2005, 437 (3): 905–910, Bibcode:2005A&A...437..905S, arXiv:astro-ph/0505307
, doi:10.1051/0004-6361:20042315
Sbordone, L.; Bonifacio, P.; Marconi, G.; Buonanno, R., Chemical abundances in Terzan 7, Memorie della Societa Astronomica Italiana, 2004, 75: 396, Bibcode:2004MmSAI..75..396S
Held, Enrico V.; Rosenberg, Alfred; Saviane, Ivo; Momany, Yazan, 写于Pucon, Chile, Geisler, D.; Grebel, E.K.; Minniti, D. , 编, The Globular Cluster Terzan 7 in the Sagittarius Dwarf Spheroidal Galaxy, Astronomical Society of the Pacific (San Francisco), March 12–16, 2001: 165 (2002), Bibcode:2002IAUS..207..165H
Terzan, Agop, Six nouveaux amas stellaires (Terzan 3-8) dans la region DU centre de la Voie lactee et les constellations DU Scorpion et DU Sagittaire, C.R. Acad. Sci., 1968, 267 (Ser. B): 1245–1248, Bibcode:1968CRASB.267.1245T
Gottlieb, Steve, Sky and Telescope, August 1, 2000, 100 (2): 112, ISSN 0037-6604