Activity in early F-type stars in the Hyades.
Abstract
Observations of the equivalent width of D3 He I A 5876 in 14 main-sequence stars in the Hyades show that stellar activity in these stars is closely similar to that seen in early F-type field stars. The onset of activity occurs at about (B - V) = 0.30 m, and the activity level in stars bluer than (B - V) = 0.45 m does not correlate with rotation. There is no evidence of a decline of activity with increasing age during the rather narrow time interval spanned by the main-sequence lifetimes of early F-type stars. The sharp minimum in lithium abundance that is seen in Hyades stars of middle F spectral type occurs at about the color that marks the boundary between temperature regimes where activity does and does not correlate with rotation.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- September 1987
- DOI:
- 10.1086/132061
- Bibcode:
- 1987PASP...99..957W
- Keywords:
-
- Early Stars;
- F Stars;
- Stellar Activity;
- Stellar Coronas;
- Stellar Evolution;
- Stellar Magnetic Fields;
- Stellar Rotation;
- Cool Stars;
- High Temperature;
- Astrophysics