Change search
ReferencesLink to record
Permanent link

Direct link
Search for the magnetic field of the O7.5 III star ξ Persei
Stockholm University, Faculty of Science, Department of Astronomy. (Institute for Solar Physics)
Show others and affiliations
2009 (English)In: Cosmic Magnetic Fields: From Planets, to Stars and Galaxies, Proceedings of the International Astronomical Union, Vol. 259, 383-384 p.Article in journal (Other academic) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2009. Vol. 259, 383-384 p.
Keyword [en]
Stars: magnetic fields, techniques: polarimetric, stars: atmospheres, stars: ξ Per, stars: early-type, stars: winds, outflows, stars: rotation, stars: pulsations
National Category
Astronomy, Astrophysics and Cosmology
Research subject
URN: urn:nbn:se:su:diva-35369OAI: diva2:287190
Available from: 2010-01-18 Created: 2010-01-18 Last updated: 2011-02-15Bibliographically approved

Open Access in DiVA

No full text

By organisation
Department of Astronomy
Astronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 18 hits
ReferencesLink to record
Permanent link

Direct link