Magnetic fields of Ap stars from full Stokes spectropolarimetric observations
2014 (English)In: PUTTING A STARS INTO CONTEXT: EVOLUTION, ENVIRONMENT, AND RELATED STARS, 2014, 380-385 p.Conference paper (Refereed)
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.
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:uu:diva-265979ISI: 000361017800054ISBN: 978-5-00086-273-5OAI: oai:DiVA.org:uu-265979DiVA: diva2:867086
International Conference on Putting A Stars into Context - Evolution, Environment, and Related Stars, JUN 03-07, 2013, Moscow, RUSSIA