Article (Scientific journals)
Probable detection of radial magnetic field gradients in the atmospheres of Ap stars
Nesvacil, N.; Hubrig, S.; Jehin, Emmanuel
2004In Astronomy and Astrophysics, 422, p. 51-L54
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Keywords :
stars: atmospheres; physical data and processes: atomic processes; atomic data; stars: abundances; stars: chemically peculiar; stars: individual: HD 965; stars: individual: HD 116114; stars: individual: 33 Lib
Abstract :
[en] For the first time the possible presence of radial gradients of magnetic fields in the atmospheres of three magnetic Ap stars has been critically examined by measurements of the mean magnetic field modulus from spectral lines resolved into magnetically split components lying on the different sides of the Balmer jump. A number of useful diagnostic lines below and above the Balmer discontinuity, only slightly affected by blends, with simple doublet and triplet Zeeman pattern have been identified from the comparison between synthetic spectra computed with the SYNTHMAG code and the high resolution and S/N spectra obtained in unpolarized light with the ESO VLT UVES spectrograph. For all three stars of our sample, HD 965, HD 116114 and 33 Lib, an increase of the magnetic field strength of the order of a few hundred Gauss has been detected bluewards of the Balmer discontinuity. These results should be taken into account in future modelling of the geometric structure of Ap star magnetic fields and the determination of the chemical abundances in Ap stars with strong magnetic fields. Based on observations obtained at the European Southern Observatory, Paranal, Chile (ESO program No. 70.D-0470).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Nesvacil, N.;  European Southern Observatory, Casilla 19001, Santiago, Chile ; Department of Astronomy, University of Vienna, Türkenschanzstrasse 17, 1180 Vienna, Austria
Hubrig, S.;  European Southern Observatory, Casilla 19001, Santiago, Chile
Jehin, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Language :
English
Title :
Probable detection of radial magnetic field gradients in the atmospheres of Ap stars
Publication date :
01 July 2004
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
422
Pages :
L51-L54
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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