| |
 |
| Paper: |
Magnetic Field Detection on Late-type Giants from Zeeman Component Decomposition |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
1255 |
| Authors: |
Sennhauser, C.; Berdyugina, S. V. |
| Abstract: |
We have recently developed a new method called Zeeman Component Decomposition (ZCD) for recovering an intrinsic line profile and the magnetic field vector from polarized spectra (Sennhauser & Berdyungina 2010b). ZCD can be deployed to various stellar spectropolarimetric data with minor prior information on the stellar parameters by fitting each atomic/molecular line depth independently. The ZCD combines advantages of inversion procedures with multi-line techniques (MLT), which is a standard tool in stellar astronomy for increasing the signal-to-noise ratio (SNR) of spectropolarimetric measurements.
We present results for the line-of-sight component BLOS from applying ZCD to spectropolarimetric (Stokes IV) observations of three evolved late-type (super-)giants obtained at the CFHT/Espadons. These results demonstrate the functionality of the ZCD on one hand, while on the other hand disclosing several differences to other multi-line techniques. In particular, we report on the first detection of a weak, probably varying magnetic field on Arcturus. |
|
|
|
|
|
