The distribution of iron and chromium over the surface of Epsilon UMa
Abstract
The distribution of Fe and Cr on the surface of Epsilon UMa has been determined using high precision profiles of FeI, FeII, CrI and CrII lines obtained with a Reticon. The mathematical methods previously described by Goncharski et al. (1977, 1981) have been used to derive maps of local equivalent width from the observational data. Both elements are concentrated in two large regions situated near the rotational equator. There is an indication that the spots for the neutral states are displaced in longitude from the spots for the singly ionized states.
- Publication:
-
Liege International Astrophysical Colloquia
- Pub Date:
- 1981
- Bibcode:
- 1981LIACo..23..265R
- Keywords:
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- A Stars;
- Chromium;
- Iron;
- Metallic Stars;
- Peculiar Stars;
- Astronomical Maps;
- Line Spectra;
- Spectral Energy Distribution;
- Stellar Rotation;
- Stellar Spectrophotometry;
- Astrophysics