Other
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pobeo..90..151k&link_type=abstract
Publications of the Astronomical Observatory of Belgrade, vol. 90, pp. 151-154
Other
Scientific paper
We report first results of magnetic field observations of nine M giants, known for having a relatively fast rotation or/and large X-ray emission. In the HRD, these stars are situated either near the tip of the RGB or high on the AGB, covering the mass range of 1 to 4 M_{&sun;}. The observations were carried out at the 2-m Bernard Lyot Telescope of the Pic du Midi observatory, using the NARVAL spectropolarimeter. For two of the stars, EK Boo and β And, definite and marginal Zeeman detections were achieved, respectively. The longitudinal magnetic field (B_l) of EK Boo varied between 0 and -8 G, B_l of β And measured -0.95 +/- 0.16 G. For the other seven giants, only a short observing period was available, and no magnetic field was detected. More observations will answer the question, whether the detected magnetic field in EK Boo is just a special case. Or is this star the "tip of the iceberg" of magnetically active M giants?
Auriere Michel
Konstantinova-Antova Renada
Schröder Klaus-Peter
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