Periodic spectral variability of the Ap star HR 234.
Abstract
Spectra of the Ap CrSrEu star HR 234 (HD 4778) at 27 A/mm were obtained on 13 nights. Contrary to earlier reports, strontium is found to have the largest variation in line strengths, with three maxima occurring with a 2.156-day period. A broad feature in the Ca II K line is also variable. Representative spectra are illustrated. Radial velocities show evidence for variability associated with spots but no spectroscopic binary motion.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- October 1980
- Bibcode:
- 1980A&A....90..341P
- Keywords:
-
- A Stars;
- Line Spectra;
- Periodic Variations;
- Stellar Spectra;
- Stellar Spectrophotometry;
- Calcium;
- K Lines;
- Trace Elements;
- Astrophysics;
- Ap Stars:Spectrum Variables