Cosmic Chemical Evolution
Springer Science & Business Media, Mar 31, 2002 - Science - 242 pages
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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Cosmic Chemical Evolution: Proceedings of the 187th Symposium of the ...
K. Nomoto,J.W. Truran
No preview available - 2002
3DUP abundance pattern accretion AGB stars Arnett Astrophys baryon baryon density Big Bang Nucleosynthesis C/O ratio calculations carbon chemical evolution models clusters CNO cycle companion star constraints core Cosmic Chemical Evolution cosmic SFR cosmic supernova rate cosmological depletion deuterium ellipticals evolutionary explosion Fe/H Figure Fowler Galactic evolution Galactic Halo galaxies Geiss halo helium high redshift Hoyle initial mass function isotopes Kobayashi Lett light element abundances LIM stars mass fraction massive stars metallicity dependence metallicity effect Milky Way disk Nature Vol Nomoto nuclear nuclei O/Fe observed phase Phys Population II predictions primordial produce progenitors radiation red giants redshift Reeves regions Schramm SD scenario second dredge-up similar stellar parameters SN la rate SNe la solar neighborhood spirals star formation Steigman stellar evolution surface temperature Turner TYPE IA SUPERNOVAE Type la Supernovae Tytler Umeda Wagoner WD mass white dwarfs X(CNO