Descendants of magnetic and non-magnetic A-type stars
Abstract
We have studied the magnetic fields of about 50 active or non-active single G-K-type red giants by means of spectropolarimetry with Narval and ESPaDOnS. Thirty giants show significant Zeeman signals. A close examination of the 17 giants with known rotational periods shows that the measured magnetic field strength is correlated with the rotation, and in particular with the Rossby number. Four giants for which the magnetic field has been found to be outstandingly strong with respect to the rotational period or the evolutionary state are identified as probable Ap star descendants. We give details of their magnetic properties, and propose criteria to identify Ap star descendants.
- Publication:
-
Putting A Stars into Context: Evolution, Environment, and Related Stars
- Pub Date:
- November 2014
- DOI:
- 10.48550/arXiv.1310.6942
- arXiv:
- arXiv:1310.6942
- Bibcode:
- 2014psce.conf..444A
- Keywords:
-
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 8 pages, to appear in the proceedings of the conference "Putting A Stars into Context: Evolution, Environment, and Related Stars"