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Search for the magnetic field of the O7.5 III star ξ Persei
- Henrichs, Huib F. (author)
-
- Schnerr, R. S. (author)
- Stockholms universitet,Institutionen för astronomi,Institute for Solar Physics
- de Jong, J. A. (author)
- show more...
- Kaper, L. (author)
- Donati, J.-F. (author)
- Catala, C. (author)
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- (creator_code:org_t)
- 2009
- 2009
- English.
- In: Cosmic Magnetic Fields: From Planets, to Stars and Galaxies, Proceedings of the International Astronomical Union. ; 259, s. 383-384, s. 383-384
- Journal article (other academic/artistic)
Abstract
Subject headings
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- Cyclical wind variability is an ubiquitous but as yet unexplained feature among OB stars. The O7.5 III(n)((f)) star ξ Persei is the brightest representative of this class on the Northern hemisphere. As its prominent cyclical wind properties vary on a rotational time scale (2 or 4 days) the star has been already for a long time a serious magnetic candidate. As the cause of this enigmatic behavior non-radial pulsations and/or a surface magnetic field are suggested. We present a preliminary report on our attempts to detect a magnetic field in this star with high-resolution measurements obtained with the spectropolarimeter Narval at TBL, France during 2 observing runs of 5 nights in 2006 and 5 nights in 2007. Only upper limits could be obtained, even with the longest possible exposure times. If the star hosts a magnetic field, its surface strength should be less than about 300 G. This would still be enough to disturb the stellar wind significantly. From our new data it seems that the amplitude of the known non-radial pulsations has changed within less than a year, which needs further investigation.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Stars: magnetic fields
- techniques: polarimetric
- stars: atmospheres
- stars: ξ Per
- stars: early-type
- stars: winds
- outflows
- stars: rotation
- stars: pulsations
- Astronomy
- Astronomi
- astronomi
- Astronomy
Publication and Content Type
- vet (subject category)
- art (subject category)
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- Donati, J.-F.
- Catala, C.
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