Subsystems of the Galactic halo, their structures and compositions
DOI:
https://doi.org/10.18524/1810-4215.2002.15.95054Ключові слова:
globular clusters, Galaxy, abundances, haloАнотація
It is shown that general populations of globular clusters and metal-poor field stars are components at least of three subsystems occupying different volumes in the Galaxy. The thick disk and proto-disk subsystems are genetically associated with the Galaxy. The age distributions of these two subsystems do not overlap. It is argued that heavy-element enrichment and the collapse of the proto-galactic medium occurred mainly in the period between the formation of the proto-disk halo and thick disk subsystems. The largest third subsystem has no metallicity gradient, most of its objects have retrograde motion in the Galaxy, some of them have unusually low content of a-elements, and their ages are comparatively low in average, supporting the hypothesis that the objects in this subsystem had an extragalactic origin.Посилання
Allen A., Santillan A., 1991, Rev. Mex. Aston. Asroph., 22, 225
Borkova T.V., Marsakov V.A., 2000, Astron Zh,77, 750 (2000, Astron. Rep, 44, 665)
Borkova T.V., Marsakov V.A., 2002, Astron Zh,79, 510, (2002, Astron Rep, 46, 460)
Carney B.W., 1996, PASP, 108, 900
Da Costa G.S., Armandroff TE, 1995, AJ,109. 2533
Dambis A.K., Rastorguev A.S., 2001, AstL, 109, 2533
Eggen O.L, Lynden-Bell D.. Sandage A., 1962, ApJ, 136, 748
Hanson R.B., Sneden C., Kraft R.P. and Fulbright J., 1998, AJ, 116, 1286
Harris W.E., 1996, AJ, 112, 1487 (rev. 22 June 1999)
Hartwick F.D.A., 1987, in the Galaxy, Ed. By G.Gilmore and B.Carwell (Dordrech t), p.281
Ibata R.A., Gilmore G., Irvin M.J., 1994, Nature, 370, 194
Ivesic Z., et al 2000, AJ, 120, 963
Lauden A.C., AJ, 1994, 108, 1016
Majewski S.R., ApJ, 1992, 78, 87
Marsakov V.A., Suchkov A.A., 1977, Astron Zh, 54, 1232 [Sov Astron, 21, 700]
Marsakov V.A., Suchkov A.A., 1978, Astron Zh, 55, 472 [Sov Astron, 22, 700]
Mironov A.V., Samus N.N., 1974, Perem. Zvezdy, 19, 337
Nissen P.E., Schuster W.J., 1997, Aap, 251, 457
Reid I.N., 1997, AJ, 114, 161
Travaglio C., Galli D., Gallino R, et. al, 1999, ApJ, 521, 691
Wise R.F.G., Gilmore G., 1988, A], 95, 1404
Yoshii Y., Tsujimoto T., Nomoto K,, 1996, ApJ, 462, 266
Zirm R., 1985, ApJ, 293, 424
Zinn R., 1993, in The Globular Clusters-Galaxy Connection, Ed. By H. Smith and J. Brodee, ASP Conf. Ser., 48, 38
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