Measurements of mean longitudinal magnetic fields in the Of?p stars HD 108 and HD 191612

Details Measurements of mean longitudinal magnetic fields in the Of?p stars HD 108 and HD 191612 Measurements of mean longitudinal magnetic fields in the Of?p stars HD 108 and HD 191612

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010an....331..781h&link_type=abstract

Astronomische Nachrichten, Vol.331, Issue 8, p.781

Astronomy and Astrophysics

Astronomy

4

Stars: Atmospheres, Stars: Individual (Hd 108, Hd 191612), Stars: Magnetic Fields, Techniques: Polarimetry

Scientific paper

Using polarimetric spectra obtained with the SOFIN spectrograph installed at the Nordic Optical Telescope, we detect a longitudinal magnetic field = -168±35 G in the Of?p star HD 108. This result is in agreement with the longitudinal magnetic field measurement of the order of -150 G recently reported by the MiMeS team. The measurement of the longitudinal magnetic field in the Of?p star HD 191612 results in = +450±153 G. The only previously published magnetic field measurement for this star showed a negative longitudinal magnetic field = -220±38 G, indicating a change of polarity over ˜100 days. Further, we report the detection of distinct Zeeman features in the narrow Ca II and Na I doublet lines for both Of?p stars, hinting at the possible presence of material around these stars. The origin of these features is not yet clear and more work is needed to investigate how magnetic fields interact with stellar wind dynamics.
Based on observations obtained with the Nordic Optical Telescope.

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