EDP Sciences
Free access
Issue
A&A
Volume 437, Number 1, July I 2005
Page(s) 227 - 234
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20042554


A&A 437, 227-234 (2005)
DOI: 10.1051/0004-6361:20042554

Discovery of magnetic fields in hot subdwarfs

S. J. O'Toole1, S. Jordan2, S. Friedrich3 and U. Heber1

1  Dr. Remeis-Sternwarte, Astronomisches Institut der Universität Erlangen-Nürnberg, Sternwartstr. 7, Bamberg 96049, Germany
    e-mail: otoole@sternwarte.uni-erlangen.de
2  Astronomisches Rechen-Institut, Mönchhofstr. 12-14, 69221 Heidelberg, Germany
3  Max-Planck-Institut für extraterrestrische Physik, Giessenbachstr., 85748 Garching, Germany

(Received 16 December 2004 / Accepted 4 March 2005 )

Abstract
We present polarisation measurements of sdB and sdO stars using FORS1 on the VLT. The observations were made as part of a project to determine whether magnetic fields in two super-metal-rich stars can explain their extreme abundance peculiarities. Field strengths of up to ~1.5 kG range have been measured at varying levels of significance in each of our six targets, however no clear evidence was found between apparently normal subdwarfs and the metal-rich objects. The origin of the magnetic fields is unknown. We also discuss the implications of our measurements for magnetic flux conservation in late stages of stellar evolution.


Key words: stars: subdwarfs -- stars: magnetic fields

SIMBAD Objects in preparation



© ESO 2005