Discovery of the Pre-Main Sequence Progenitors of the Magnetic Ap/Bp Stars?

Details Discovery of the Pre-Main Sequence Progenitors of the Magnetic Ap/Bp Stars? Discovery of the Pre-Main Sequence Progenitors of the Magnetic Ap/Bp Stars?

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99..129d&link_type=abstract

Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.129

Astronomy and Astrophysics

Astronomy

Scientific paper

The magnetic Ap/Bp stars represent about 5% of all intermediatemass main sequence stars, and are characterised by strong, globallyordered surface magnetic fields. The physical impact of the presence of these fields is clear: atmospheric structure, photospheric chemical abundances, mass loss, rotation, and ultimately stellar evolution are all modified, to various extents, due to the interaction of the magnetic field with the stellar plasma. Remarkably, the origin of these magnetic fields remains a total mystery. In order to trace the presence of these fields back to the premain sequence (PMS), we have undertaken an extensive search for magnetic fields in the Herbig Ae/Be (HAeBe) stars, the PMS progenitors of the main sequence intermediate-mass stars. Using both the FORS1 spectropolarimeter at the ESO-VLT and the brand-new ESPaDOnS spectropolarimeter at the CFHT, we have surveyed over 50 HAeBe stars for the presence of longitudinal magnetic fields. Here we review the details of our investigation, and announce the detection of magnetic fields and chemical peculiarities in the HAeBe stars HD 72106 and HD 101412. These detections may well represent the identification of the pre-main sequence progenitors of the magnetic Ap/Bp stars. At the same time, we fail to confirm claims by Hubrig et al. (2004) of the presence of magnetic fields in the Herbig Ae star HD 139614.

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