Rotation and Macroturbulence in Bright Giants (original) (raw)
ADS
Abstract
Spectral line profiles of 35 F, G, and K bright giants were analyzed to obtain rotation rates, v sin i, and macroturbulence dispersion. This sample indicates that rotation rates of cool class II giants is less than 11 km/s, in contrast with some recent periodicity measurements. Macroturbulence dispersion generally increases with effective temperature, but the range of values at a given effective temperature is much larger than seen for lower luminosity classes; this is interpreted in terms of red-giant and blue-loop evolution. No evidence is found for angular momentum dissipation on the first crossing of the H-R diagram.
Publication:
The Astrophysical Journal
Pub Date:
November 1986
DOI:
Bibcode:
Keywords:
- Giant Stars;
- Line Spectra;
- Stellar Rotation;
- Turbulence Effects;
- Angular Velocity;
- Astronomical Catalogs;
- Hertzsprung-Russell Diagram;
- K Stars;
- Stellar Evolution;
- Stellar Temperature;
- Astrophysics;
- LINE PROFILES;
- STARS: ROTATION;
- TURBULENCE