Mapping of iron and chromium on the surface of the AP star Epsilon Ursae Majoris
Abstract
Epsilon Ursae Majoris (HD 112185) is one of the brightest peculiar A stars, and it has long been classified as Ap. In connection with an investigation of the surface of Epsilon UMa, high-precision profiles of the Fe I, Fe II, Cr I, Cr II lines in the stellar spectrum have been obtained with the aid of a reticon on a 1.2-m telescope. The obtained profiles have been employed to solve the inverse problem numerically by means of a method described by Goncharskii et al. (1977). The line profiles were recorded between March and August 1980 at 2.4-A dispersion with the coude spectrograph of a 1.2-A reflector. The profiles were recorded to better than 1 percent photometric accuracy.
- Publication:
-
Soviet Astronomy Letters
- Pub Date:
- February 1982
- Bibcode:
- 1982SvAL....8...15W
- Keywords:
-
- A Stars;
- Astronomical Maps;
- Chromium;
- Iron;
- Mass Distribution;
- Peculiar Stars;
- Metallic Stars;
- Stellar Rotation;
- Stellar Spectra;
- Stellar Spectrophotometry;
- Astrophysics;
- A STARS;
- ASTRONOMICAL MAPS;
- CHROMIUM;
- IRON;
- MASS DISTRIBUTION;
- PECULIAR STARS;
- METALLIC STARS;
- STELLAR ROTATION;
- STELLAR SPECTRA;
- STELLAR SPECTROPHOTOMETRY