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| Paper: |
The Activity and Rotation Limit in the Hyades |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
313 |
| Authors: |
Seemann, U.; Reiners, A.; Seifahrt, A.; Kürster, M. |
| Abstract: |
We conduct a study of K to M type stars to investigate the activity and the rotation limit in the Hyades. We use a sample of 40 stars in
this intermediate-age cluster (≈625 Myr) to probe stellar rotation in the threshold region where stellar activity becomes prevalent.
Here we present projected equatorial velocities (vrotsin i) and chromospheric activity measurements (Hα) that indicate the existence of fast rotators in the
Hyades at spectral types where also the fraction of stars with Hα emission shows a rapid increase (“Hα limit”).
The locus of enhanced rotation (and activity) thus seems to be shifted to
earlier types in contrast to what is seen as the rotation limit in field stars. The relation between activity and rotation appears to be
similar to the one observed in field stars. |
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