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Magnetic fields in Herbig Ae stars

Published online by Cambridge University Press:  01 August 2006

R. V. Yudin
Affiliation:
Central Astronomical Observatory of the Russian Academy of Sciences at Pulkovo, 196140 Saint-Petersburg, Russia, email: ruslan61@gao.spb.ru; pogodin@gao.spb.ru
M. A. Pogodin
Affiliation:
Central Astronomical Observatory of the Russian Academy of Sciences at Pulkovo, 196140 Saint-Petersburg, Russia, email: ruslan61@gao.spb.ru; pogodin@gao.spb.ru
S. Hubrig
Affiliation:
European Southern Observatory, Casilla 19001, Santiago 19, Chile, email: shubrig@eso.org
M. Schöller
Affiliation:
European Southern Observatory, Casilla 19001, Santiago 19, Chile, email: shubrig@eso.org
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Abstract

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We present and discuss the results of a comprehensive analysis of magnetic field measurements for a group of seven young Herbig Ae/Be stars obtained using low-resolution spectropolarimetry with FORS1 at the VLT. The first definite evidence for the presence of surface magnetic fields has been found only recently in the Herbig Ae stars HD 139614, HD 31648 and HD 144432 (Hubrig et al. 2004; Hubrig et al. 2006) from the measurement of circular polarization in Ca II lines and hydrogen lines located in the spectral region from 3900 to 4900 Å. The unusual Herbig Ae star HD 190073 shows distinctive Zeeman features in the Ca II doublet which displays several components in both H and K lines. The most recent analysis carried out separately for different lines has shown that Zeeman features appear in metallic lines in all seven objects of our programme. The most prominent of them are seen in lines of the CaII doublet possibly of both photospheric and circumstellar origin. The circumstellar Balmer line components demonstrate the existence of a magnetic field in HD 144432 and HD 31648. The photospheric components of these lines with signs of magnetic field are present in HD 144668.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2007

References

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