The rotation effect - A mechanism for measuring granulation velocities in stars.
Abstract
The Doppler effects of stellar granulation, when combined with those of the star's rotation, have been predicted to enhance the asymmetries in spectral line profiles, a process referred to as the rotation effect. A dozen F stars were observed for the rotation effect. The effect is seen in some, but not all, of them. The asymmetries, as expressed in the line bisectors, are compared to numerical simulations from which it is possible to obtain the average velocity of rise of the hot granules on an absolute velocity scale. Values ≡ -1.5 to -3.0 km s -1 are deduced.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- March 1986
- DOI:
- 10.1086/131759
- Bibcode:
- 1986PASP...98..319G
- Keywords:
-
- Doppler Effect;
- Photosphere;
- Stellar Activity;
- Stellar Rotation;
- Stellar Spectra;
- Computational Astrophysics;
- F Stars;
- Line Spectra;
- Starspots;
- Velocity Measurement;
- Astrophysics