The magnetic field of the B1/B2V star sigma Lup
Article
Article Title | The magnetic field of the B1/B2V star sigma Lup |
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Article Category | Article |
Authors | Henrichs, Huib F. (Author), Kolenberg, Katrien (Author), Plaggenborg, Benjamin (Author), Marsden, Stephen C. (Author), Waite, Ian A. (Author) and Wade, Gregg A. (Author) |
Editors | Neiner, C., Wade, G., Meynet, G. and Peters, G. |
Journal Title | Proceedings of the International Astronomical Union Symposium (IAU 2010) |
Journal Citation | 6 (S272), pp. 192-193 |
Number of Pages | 2 |
Year | 2010 |
Place of Publication | United Kingdom |
Digital Object Identifier (DOI) | https://doi.org/10.1017/S1743921311010295 |
Web Address (URL) | https://www.proquest.com/docview/1318753657 |
Abstract | The ultraviolet stellar wind lines of the photometrically periodic variable early B-type star σ Lupi were found to behave very similarly to what has been observed in known magnetic B stars, although no periodicity could be determined. AAT spectropolarimetric measurements with SEMPOL were obtained. We detected a longitudinal magnetic field with varying strength and amplitude of about 100 G with error bars of typically 20 G. This type of variability supports an oblique magnetic rotator model. We fold the equivalent width of the 4 usable UV spectra in phase with the well-known photometric period of 3.019 days, which we identify with the rotation period of the star. The magnetic field variations are consistent with this period. Additional observations with ESPaDOnS attached to the CFHT strongly confirmed this discovery, and allowed to determine a precise magnetic period. Like in the other magnetic B stars the wind emission likely originates in the magnetic equatorial plane, with maximum emission occurring when a magnetic pole points towards the Earth. The 3.0182 d magnetic rotation period is consistent with the photometric period, with maximum light corresponding to maximum magnetic field. No helium or other chemical peculiarity is known for this object. |
Keywords | outflows; atmospheres; early-type stars; σ Lup; magnetic fields; rotation; winds; polarimetric |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
510105. General relativity and gravitational waves | |
510903. Mesospheric, thermospheric, ionospheric and magnetospheric physics | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Amsterdam, Netherlands |
University of Vienna, Austria | |
Anglo-Australian Observatory, Australia | |
Centre for Astronomy, Solar Radiation and Climate | |
Royal Military College of Canada, Canada | |
Event | International Astronomical Union Symposium (IAU 2010): Active OB stars: Structure, Evolution, Mass Loss, and Critical Limits |
International Astronomical Union Symposium | |
Institution of Origin | University of Southern Queensland |
ISBN | 9780521198400 |
Event Details | International Astronomical Union Symposium (IAU 2010): Active OB stars: Structure, Evolution, Mass Loss, and Critical Limits Event Date 19 to end of 23 Jul 2010 Event Location Paris, France |
Event Details | International Astronomical Union Symposium IAU Symposium |
https://research.usq.edu.au/item/q2v00/the-magnetic-field-of-the-b1-b2v-star-sigma-lup
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