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

被引：7
作者：
Hubrig, S. [1 ]
Ilyin, I. [1 ]
Schoeller, M. [2 ]
机构：
[1] Astrophys Inst Potsdam, D-14482 Potsdam, Germany
[2] European So Observ, D-85748 Garching, Germany
来源：
ASTRONOMISCHE NACHRICHTEN | 2010年 / 331卷 / 08期
关键词：
stars: atmospheres; stars:; individual; (HD; 108; HD; 191612); stars: magnetic fields; techniques: polarimetry; O STARS; HD-191612; ORIONIS; SPECTRA;
D O I：
10.1002/asna.201011412
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Using polarimetric spectra obtained with the SOFIN spectrograph installed at the Nordic Optical Telescope, we detect a longitudinal magnetic field < B(z)> = -168 +/- 35 G in the Of?p star HD108. This result is in agreement with the longitudinal magnetic field measurement of the order of -150G recently reported by the MiMeS team. The measurement of the longitudinal magnetic field in the Of?p star HD 191612 results in < B(z)> = +450 +/- 153 G. The only previously published magnetic field measurement for this star showed a negative longitudinal magnetic field < B(z)> = -220 +/- 38 G, indicating a change of polarity over similar to 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. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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页码：781 / 784
页数：4
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