Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283..189b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 283, no. 1, p. 189-201
Astronomy and Astrophysics
Astrophysics
29
A Stars, Abundance, Calcium, Magnetic Stars, Peculiar Stars, Stellar Atmospheres, Stellar Composition, H Lines, Hydrodynamics, K Lines, Photosphere, Stellar Magnetic Fields, Stellar Models, Stellar Spectra, Stellar Temperature
Scientific paper
Very recent observational and theoretical studies have shown that an abundance stratification of chemical elements seems to be present in the atmosphere of the Ap SrCrEu star 53 Cam. This is fundamental for our understanding of the structure and the stability of the stellar atmosphere of magnetic stars. In contrast with previous work from the author which were devoted to an intensive study of 53 Cam, the purpose of the present paper is to investigate abundance stratification in a smaple of 28 Ap stars, mainly of the SrCrEu type. From the analysis of the well-known peculiar profile of the Ca II K line these objects and from a differential analysis using the Ca II H line, we obtain that a large Ca abundance stratification seems to be present in all the Ap stars with Teff less than 9000 K. For hotter objects, the method used in this paper does not permit to conclude. This analysis supports strongly the conclusions from the diffusion model and gives new constraints on hydrodynamical processes in the photosphere of Ap stars. It constitutes the first evidence for a symmetric abundance stratification of Ca in a large sample of magnetic stars.
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