The Rotation Period of (epsilon)Eri From Photometry of its Starspots
Abstract
BV photometry at six observatories in 1988/1989 and 1989/1990 shows variability resulting from five starspots which lived 1 or 2 months each, had rotation periods in the range P between 10.0d and 12.3d, and had amplitudes in the range 0.01 m - 0.03 m. From the range in P it was possible to estimate k greater than 0.20 +/- 0.05 for the differential rotation coefficient. Ca II K-line photometry, polarimetry, and earlier photometry reported in the literature has also shown variability with periodicities in the same 10 d -12 d range.
- Publication:
-
The Astronomical Journal
- Pub Date:
- November 1991
- DOI:
- 10.1086/116005
- Bibcode:
- 1991AJ....102.1813F
- Keywords:
-
- Starspots;
- Stellar Rotation;
- Stellar Spectrophotometry;
- Dwarf Stars;
- K Stars;
- Orbital Elements;
- Solar Oscillations;
- Variable Stars;
- Astronomy;
- STARS: ROTATION;
- STARS: CHROMOSPHERES