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1995PASP..107.1016H - Publ. Astron. Soc. Pac., 107, 1016-1016 (1995/October-0)
Old open clusters as probes of stellar and galactic disk evolution. (Dissertation summary).
HUFNAGEL B.
Abstract (from CDS):
Stellar clusters are often used to study stellar evolution because such stars are coeval and equidistant. The results are then extrapolated to disk stars with little proof that the old disk stars originated in clusters. An essential link may be moving groups, stars that are not in close physical proximity but have similar kinematics and [Fe/H]. The age of eight HR 1614 Moving Group dwarfs was investigated, and it was determined that all eight are at least 3 Gyr old. This supports the scenario that many of the disk field stars formed in open clusters which subsequently were disrupted.
Theories about Galactic disk evolution can be evaluated by comparing their predictions to the old open cluster system. The "inside-out" type of theory predicts that the ISM in the inner part of the Galactic disk is older and more chemically evolved than that of the outer part. Two samples of old open clusters, one from the inner and one from the outer disk, had significantly different mean [Fe/H] values, but similar mean ages. The former is in accordance with inside-out theories: the latter is not. The system of old open clusters appears to have extended to a larger radial distance ∼5-7 Gyr ago, also not consistent with inside-out theories. These results can not be attributed to the preferential destruction of inner-disk open clusters.
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