A Search for Rotational Modulation of the Lithium Line in Spotted Stars
Abstract
No significant rotational modulation of the equivalent width of the LiI blend was detected for any of the programme stars. The derived upper limits (ΔW/W < 5-10%) are substantially smaller than what had been suggested previously on the basis of the solar analogy. If we assume that the enhancement of the equivalent width of the LiI line in starspots is about the same as for the Sun, the above upper limits imply a spot coverage factor of only a few percent, much smaller than that derived from the photometric variations (15-25%). It is clear therefore that the enhancement of the Lithium line in the spots of these stars, if present, is certainly lower than for the Sun.
- Publication:
-
Surface Inhomogeneities on Late-Type Stars
- Pub Date:
- 1992
- DOI:
- 10.1007/3-540-55310-X_182
- Bibcode:
- 1992LNP...397..319P