The Of?p star, NGC1624-2, has the largest magnetic field ever found for an O-type star. Like many magnetic O- type stars NGC1624-2 has a slow rotation with a period of ~158 days but its strong magnetic field strength of 20 kG (Wade et al. 2012) is an order of magnitude larger than those of other O-type stars. This study aims to model the geometry of the longitudinal magnetic field and to determine the surface field modulus using spectropolarimetry data from the ESPaDOnS instrument at the Canada-French-Hawaii Telescope. Our preliminary results found a longitudinal field strength, <Bz>, of 5.27±0.7 kG, which agrees with the original results from Wade et al. (2012) who found a <Bz> of 5.35±0.5 kG. Zeeman splitting as never seen before observed in an O-type star spectra. However, we observe it in the spectra for this star, which allows us to put unprecedented constraints on the field topology compared to other magnetic O-type stars. This model will help with the interpretation of observations of NGC1624-2's giant magnetosphere obtained with Chandra and HST.
American Astronomical Society Meeting Abstracts #227
- Pub Date:
- January 2016