Searching for links between magnetic fields and stellar evolution. I. A survey of magnetic fields in open cluster A- and B-type stars with FORS1

Context. About 5% of upper main sequence stars are permeated by a strong magnetic field, the origin of which is still matter of debate. Aims. With this work we provide observational material to study how magnetic fields change with the evolution of stars on the main sequence, and to constrain theory...

Full description

Saved in:
Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2006-05, Vol.450 (2), p.777-791
Main Authors: BAGNULO, S, LANDSTREET, J. D, MASON, E, ANDRETTA, V, SILAJ, J, WADE, G. A
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Context. About 5% of upper main sequence stars are permeated by a strong magnetic field, the origin of which is still matter of debate. Aims. With this work we provide observational material to study how magnetic fields change with the evolution of stars on the main sequence, and to constrain theory explaining the presence of magnetic fields in A and B-type stars. Methods. Using FORS1 in spectropolarimetric mode at the ESO VLT, we have carried out a survey of magnetic fields in early-type stars belonging to open clusters and associations of various ages. Results. We have measured the magnetic field of 235 early-type stars with a typical uncertainty of 6100 G. In our sample, 97 stars are Ap or Bp stars. For these targets, the median error bar of our field measurements was 680 G. A field has been detected in about 41 of these stars, 37 of which were not previously known as magnetic stars. For the 138 normal A and B-type stars, the median error bar was 136 G, and no field was detected in any of them.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361:20054223