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). |
Зміст
Supernova Observing Web SNOW Project with | 14 |
New Insights on Stellar | 17 |
Conference Abstracts in Alphabetical Order | 26 |
Abundance Pattern of Supergiants in the Field of | 32 |
Type 1A Supernovae and Chemical Evolution of Galaxies | 33 |
Age Problem Based on the Abundance Ratio from | 34 |
Evolution of the ColourMagnitude Relation | 45 |
The Chemical Evolution of Light Elements in Our Galaxy | 47 |
The Spectral Evolution of Elliptical Galaxies in FIR | 59 |
Constraints on Galaxy Formation from Extragalactic | 62 |
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Cosmic Chemical Evolution International Astronomical Union. Symposium,J.W. Truran Обмежений попередній перегляд - 2002 |
Cosmic Chemical Evolution: Proceedings of the 187th Symposium of the ... K. Nomoto,J.W. Truran Попередній перегляд недоступний - 2002 |
Cosmic Chemical Evolution: Proceedings of the 187th Symposium of the ... K. Nomoto,J.W. Truran Попередній перегляд недоступний - 2012 |
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3DUP ³He abundance pattern accretion AGB stars Arnett Astrophys baryon baryon density Big Bang Nucleosynthesis Burles burning C/O ratio calculations carbon chemical evolution models clusters CNO cycle companion star constraints Cosmic Chemical Evolution cosmic SFR cosmic supernova rate cosmological depletion deuterium ellipticals evolutionary explosion Fe/H Figure Galactic evolution Galactic Halo galaxies halo helium high redshift Hoyle hydrogen initial mass function isotopes J.W. Truran eds Lett light element abundances LIM stars mass fraction massive stars metallicity dependence metallicity effect Nature Vol Nomoto and J.W. nuclei O/Fe observed phase Phys Population II predictions primordial produce progenitors red giants redshift Reeves regions Schramm SD scenario second dredge-up similar stellar parameters SN Ia rate SNe Ia solar neighborhood spirals star formation Steigman stellar evolution surface temperature Turner Type Ia supernovae Tytler Umeda WD mass white dwarfs X(CNO