A Correlative Study of the Variability of XI BOO A
Abstract
Magnetic field measurements of the young G8 dwarf xi Boo A indicate that there are at least three distinct states of the stellar magnetic field (perhaps analogous to solar coronal holes, large scale structures, and active regions), and that the magnetic field configuration varies rapidly. The ultraviolet line fluxes and coronal soft X-ray flux are similarly variable. We propose to continue our investigation of the role of the magnetic field in heating the outer atmospheric layers of this star by correlating the variability of the two. Observations during the past year clearly show variability on timescales shorter than the 10^d.15 stellar rotation period. We propose simultaneous IUE, spectrophotometric, and magnetic observations spanning a complete stellar rotation period, on two occasions separated by six stellar rotations (two months), to search for correlated variability in the structure of the outer atmosphere and the stellar magnetic field configuration.
- Publication:
-
IUE Proposal
- Pub Date:
- 1982
- Bibcode:
- 1982iue..prop.1136L