The D3 5876 Å line in main sequence stars: a search for rotational modulation in ɛ Eri and κ Cet.
Abstract
High-resolution, low-noise spectra of the He I 5876 Å (D3) absorption line in 6 main sequence stars are discussed. A marked variation of D3 in κ Cet over a 17 d period is attributed to rotational modulation: the equivalent width Wλ varied between 17.4 and 25.8 mÅ. No modulation is seen in ɛ Eri. The D3 line was also seen in spectra of χ1 Ori, χ Eri, and ζ Dor, but not seen in ο2 Eri.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- December 1983
- Bibcode:
- 1983A&A...128..110L
- Keywords:
-
- Chromosphere;
- D Lines;
- Late Stars;
- Main Sequence Stars;
- Stellar Spectra;
- Absorption Spectra;
- Helium;
- Spectral Line Width;
- Visible Spectrum;
- Astrophysics;
- Chromospheres:Main-Sequence Stars;
- Main-Sequence Stars:Chromospheres;
- Main-Sequence Stars:Stellar Activity