| Cosmic Chemical Evolution: Proceedings of the 187th Symposium of the International Astronomical Union, Held at Kyoto, Japan, 26-30 August 1997 Softcover Repri Edition Contributor(s): Nomoto, K. (Editor), Truran, J. W. (Editor) |
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ISBN: 1402004494 ISBN-13: 9781402004490 Publisher: Springer OUR PRICE: $161.49 Product Type: Paperback - Other Formats Published: March 2002 Annotation: The IAU Symposium papers collected in this volume address virtually all aspects of the problem of nucleosynthesis, galactic chemical evolution, and cosmic chemical evolution. Discussions on theoretical models as well as observational studies are included. Theoretical models of nucleosynthesis in the Big Bang, in the first stellar generations, and in stars and supernovae over the histories of our Galaxy and other galaxies provide a measure of element production over the lifetime of the Universe. Observational studies of abundances in stars, galaxies, gas concentrations in galaxies and clusters of galaxies, the intergalactic medium, and gas clouds at high redshift are reviewed. |
| Additional Information |
| BISAC Categories: - Science | Physics - Astrophysics - Medical | Alternative & Complementary Medicine - Science | Astronomy |
| Dewey: 523.02 |
| Series: International Astronomical Union Symposia |
| Physical Information: 0.59" H x 6.34" W x 9.44" (0.90 lbs) 242 pages |
| Descriptions, Reviews, Etc. |
| Publisher Description: 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). |