Silicon distribution on the surface of the CP-star Epsilon UMa (HD 112185)

Details Silicon distribution on the surface of the CP-star Epsilon UMa (HD 112185) Silicon distribution on the surface of the CP-star Epsilon UMa (HD 112185)

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pazh...17...60t&link_type=abstract

Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 17, Jan. 1991, p. 60-66. In Russian. In Russian. In Russian.

Astronomy and Astrophysics

Astronomy

1

Peculiar Stars, Silicon, Stellar Composition, Stellar Spectra, Abundance, Spatial Distribution, Spectral Line Width

Scientific paper

Phase variations of equivalent widths of Cr II, Ti II, Fe II and Si II lines are studied, as well as those of the lambda 4130 Si II line. This makes it possible to obtain additional new data on the surface structure of this star and, by solving the inverse problem (Doppler mapping), to map the distribution of Si on the surface of the CP-star Epsilon UMa. Silicon is concentrated in two large spots on the surface, between the iron and chromium spots found by Wehlau et al. (1982). The general deficiency of Si found by Sadakane (1981) is confirmed, but the abundance of Si in the spots is close to normal, while on the remainder of the surface the deficiency is more than 2 Dex.

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