The gap of differential rotation in early F-type stars
Abstract
We present new measurements of the rotational profile of 56 nearby stars of spectral types A-F obtained by line profile analysis. Together with earlier work, we now know of 33 stars in which Sun-like differential rotation was identified by line profile analysis. We find evidence of two populations of differential rotators, one group of rapidly rotating A stars at the granulation boundary with strong horizontal shear, and another group of mid- to late-F type stars with moderate rates of rotation and less shear. There is a gap between A and F stars, in which the stars appear to exhibit very little shear. Apparently, the physical conditions of differential rotation change at early-F spectral types.
- Publication:
-
Solar and Astrophysical Dynamos and Magnetic Activity
- Pub Date:
- July 2013
- DOI:
- 10.1017/S1743921313002470
- Bibcode:
- 2013IAUS..294..193E
- Keywords:
-
- Stars: rotation;
- Stars: fundamental parameters;
- Hertzsprung-Russell diagram