9781402004490 - cosmic chemical evolution: proceedings of the 187th symposium of the international astronomical union, held at kyoto, japan, 26-30 august 1997 ... astronomical union symposia, 187, band 187) (4 Ergebnisse)
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Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - The open cluster NGC 6791 is now considered both the oldest and the most metal-rich known. Its age is 8 -10 Gyrs, twice as old as the canonical solar-metallicity cluster M67 (Garnavich et al. 1994; Demarque, Green, & Guenther 1992; Tripicco et al. 19…95). That its metallicity is significantly above solar is suggested from moderate-resolution spectroscopy and from a mismatch of its color-magnitude diagram (CMD) with solar-metallicity isochrones. Tripicco et al. (1995) find [Fe/H] = +0.27 to +0.44. The cluster population is rich. In addition to about a dozen red giants and two dozen red horizontal-branch stars, the cluster has several very hot HB stars (Kaluzny & Udalski 1992). Liebert et al. (1994) have shown that the extremely blue stars are mostly sdB/sdO stars and at least 3 or 4 are likely cluster members, the first ever discovered in an open cluster. These may provide the key to the puzzling upturn in ultraviolet flux below 1500A seen in many high-metallicity systems (Burstein et al. 1988; Ferguson et al. & Liebert 1993).
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Zustand: New. Proceedings of the 187th Symposium of the International Astronomical Union, held in Kyoto, Japan, August 26-30, 1997 Editor(s): Nomoto, K.; Truran, James W. Series: International Astronomical Union Symposia (Closed). Num Pages: 242 pages, biography. BIC Classification: PGK. Category: (P) Professional & Vocational;…(UP) Postgraduate, Research & Scholarly. Dimension: 240 x 160 x 15. Weight in Grams: 409. . 2002. Softcover reprint of the original 1st ed. 2002. Paperback. . . . . Books ship from the US and Ireland.
