A highly sensitive search for magnetic fields in B, A and F stars

Details A highly sensitive search for magnetic fields in B, A and F stars A highly sensitive search for magnetic fields in B, A and F stars

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...392..637s&link_type=abstract

Astronomy and Astrophysics, v.392, p.637-652 (2002)

Astronomy and Astrophysics

Astrophysics

77

Line: Profiles, Polarization, Stars: Chemically Peculiar, Stars: Magnetic Fields, Stars: Atmospheres

Scientific paper

Circular spectropolarimetric observations of 74 stars were obtained in an attempt to detect magnetic fields via the longitudinal Zeeman effect in their spectral lines. The sample observed includes 22 normal B, A and F stars, four emission-line B and A stars, 25 Am stars, 10 HgMn stars, two lambda Boo stars and 11 magnetic Ap stars. Using the Least-Squares Deconvolution multi-line analysis approach (Donati et al. \cite{donati97etal}), high precision Stokes I and V mean signatures were extracted from each spectrum. We find absolutely no evidence for magnetic fields in the normal, Am and HgMn stars, with upper limits on longitudinal field measurements usually considerably smaller than any previously obtained for these objects. We conclude that if any magnetic fields exist in the photospheres of these stars, these fields are not ordered as in the magnetic Ap stars, nor do they resemble the fields of active late-type stars. We also detect for the first time a field in the A2pSr star HD 108945 and make new precise measurements of longitudinal fields in five previously known magnetic Ap stars, but do not detect fields in five other stars classified as Ap SrCrEu. We also report new results for several binary systems, including a new vsin i for the rapidly rotating secondary of the Am-delta Del SB2 HD 110951. Based on observations obtained using the MuSiCoS spectropolarimeter on the Bernard Lyot telescope, l'Observatoire du Pic du Midi, France.

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