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Astron. Astrophys. 332, 224-234 (1998)

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Metal abundances of A-type stars in galactic clusters *

II. Pleiades, Coma Berenices, Hyades, and Praesepe

A. Hui-Bon-Hoa and G. Alecian

Laboratoire d'Astrophysique Extragalactique et de Cosmologie, CNRS-(URA 173), Observatoire de Paris, Université Paris 7, DAEC, Observatoire de Meudon, F-92195 Meudon Cedex, France

Received 7 July 1997 / Accepted 24 November 1997


A study of chemical composition for 23 A-type stars in four nearby open clusters (Pleiades, Coma, Hyades and Praesepe) has derived detailed abundances for Mg, Ca, Sc, Cr, Fe, and Ni from high resolution spectroscopy. These results are discussed using the microscopic diffusion model, which yields time-dependent element stratifications as in the case of Am stars. For the Pleiades, the youngest cluster, we find several atypical abundance patterns, which may be transient phases of the Am phenomenon. The members of the older clusters show globally more classical patterns.

Key words: open clusters: Pleiades; Coma; Hyades; Praesepe – stars: abundances; chemically peculiar

* Based on observations collected at the Observatoire de Haute-Provence (France)

Send offprint requests to: A. Hui-Bon-Hoa

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© European Southern Observatory (ESO) 1998

Online publication: March 10, 1998