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2008A&A...483..567G - Astronomy and Astrophysics, volume 483, 567-570 (2008/5-4)

Chemical composition of A and F dwarfs members of the Pleiades open cluster.

GEBRAN M. and MONIER R.

Abstract (from CDS):

We derive the abundances of 18 chemical elements for 16 A-dwarf, both normal and chemically-peculiar, and 5 F-dwarf members of the Pleiades open cluster to place constraints on evolutionary models. Abundances and rotational and microturbulent velocities were derived by fitting synthetic spectra to high-resolution (R∼42000 and R∼75000) observations of high signal-to-noise ratio (S/N). The abundances exhibit correlation with neither the effective temperature nor the projected rotational velocity. Interestingly, A stars exhibit larger star-to-star variations in C, Sc, Ti, V, Cr, Mn, Sr, Y, Zr and Ba, than F stars. F stars have solar abundances of almost all elements. In A stars, the abundances of Si, Ti and Cr are correlated with that of Fe, and the [X/Fe] ratios are solar for these three elements. The derived abundances are compared with the predictions of evolutionary models for the age of Pleiades (100Myr). For F stars, small predicted underabundances of light elements and overabundances of Cr, Fe and Ni are confirmed by our findings. For A stars, the predicted overabundances in iron-peak elements are confirmed for a few stars only. The large scatter in the abundances of A stars, discovered previously in the Hyades, Coma Berenices, UMa group, and in field stars, appears to be a characteristic property of dwarf A stars. Hydrodynamical processes competing with radiative diffusion in the radiative zone of A dwarfs, could account for the scatter in abundances that we determine.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: rotation - diffusion - Galaxy: open clusters and associations: individual: Pleiades

Simbad objects: 26

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2019.10.17-18:49:04

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