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Magnetic fields of Ap stars from full Stokes spectropolarimetric observations
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2014 (English)In: PUTTING A STARS INTO CONTEXT: EVOLUTION, ENVIRONMENT, AND RELATED STARS, 2014, 380-385 p.Conference paper, Published paper (Refereed)
Abstract [en]

Current knowledge about stellar magnetic fields relies almost entirely on observations of circular polarization. Few objects have been observed in all four Stokes parameters. The magnetic Ap star HD24712 (DO Eri, HR 1217) was recently observed in the Stokes IQUV parameters with the HARPSpol instrument at the 3.6-m ESO telescope as part of our project at investigating Ap stars in all four Stokes parameters. The resulting spectra have dense phase coverage, resolving power >10(5), and S/N ratio of 300-600. These are the highest quality full Stokes observations obtained for any star other than the Sun. We present preliminary results from magnetic Doppler imaging of HD24712. This analysis is the first step towards obtaining detailed 3-D maps of magnetic fields and abundance structures for HD24712 and for other Ap stars that we are currently observing with HARPSpol.

Place, publisher, year, edition, pages
2014. 380-385 p.
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-265979ISI: 000361017800054ISBN: 978-5-00086-273-5 (print)OAI: oai:DiVA.org:uu-265979DiVA: diva2:867086
Conference
International Conference on Putting A Stars into Context - Evolution, Environment, and Related Stars, JUN 03-07, 2013, Moscow, RUSSIA
Available from: 2015-11-04 Created: 2015-11-04 Last updated: 2017-01-25Bibliographically approved

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Rusomarov, NaumKochukhov, OlegPiskunov, Nikolai

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