Cosmic Chemical EvolutionSpringer Science & Business Media, 31 бер. 2002 р. - 242 стор. 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. 1995). 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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Загальні терміни та фрази
3DUP ³He a/Fe absorption lines abundance patterns abundance ratios accretion AGB models AGB stars ASCA Astrophys baryon Big Bang Nucleosynthesis burning C/O ratio carbon chemical evolution models cloudlets clouds Cosmic Chemical Evolution cosmological depletion disk dredge-up element abundances elliptical galaxies emission enrichment evolutionary Fe/H Figure fluorine fraction galactic halos globular clusters heavy elements HII region interstellar iron abundance J.W. Truran eds light element Linsky luminosity Majewski massive stars metal-poor metal-rich Milky MNRAS neutron neutron-capture elements Nissen Nomoto and J.W. nuclei nucleosynthesis observed open clusters optical parameters PCC's predicted primordial produced progenitors red giants redshift regions s-process sample scenario Schramm shows SNe Ia Sneden solar spectra spirals star formation star formation rate stellar population temperature timescale Type II supernovae Tytler University velocity white dwarf X-ray yields