Abundances in Open Clusters: Model-Atmosphere Abundance Analysis of Stars in the Pleiades and Hyades Clusters

Abstract

view Abstract Citations (63) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Abundances in Open Clusters: Model-Atmosphere Abundance Analysis of Stars in the Pleiades and Hyades Clusters Chaffee, Frederic H., Jr. ; Carbon, Duane F. ; Strom, Stephen E. Abstract Detailed analysis of six F and G dwarfs in the Pleiades and fourteen in the Hyades indicates that the Fe/H ratio in the Hyades is 50 percent higher than that in the Pleiades, the latter yielding the solar value. To gain insight into the cause of the differences in observed narrow-band photometric indices between the clusters, a grid of blanketed model atmospheres was computed. The models provide estimates of the changes in the Stro"mgren four-color indices caused by variations in the metal abundance z and the microturbulent velocity . The trajectories in the (w1, b - y)-plane resulting from either of these variations are similar and difficult to distinguish observationally. The trajectories in the (c1, b - plane, however, differ significantly, and in some cases this may permit these two atmospheric parameters to be distinguished by the photometry alone. In the case of the Pleiades and Hyades, it appears that the observed differences in and can explain the photometric differences between the clusters. However, the effects of initial helium content and stellar evolution considerably complicate the interpretation of the diagrams of these clusters; interpretation is even more difficult for more heterogeneous samples of stars. Publication: The Astrophysical Journal Pub Date: June 1971 DOI: 10.1086/150985 Bibcode: 1971ApJ...166..593C full text sources ADS | data products SIMBAD (26)