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A search for radial magnetic field gradients in Ap atmospheres
Nesvacil, N.; Hubrig, S.; Jehin, Emmanuel et al.
2004In Zverko, J. (Ed.) The A-Star Puzzle
 

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Keywords :
Stars: chemically peculiar; stars: magnetic fields; stars: individual (HD 965; HD 116114; 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 (HD 137949), 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Nesvacil, N.
Hubrig, S.
Jehin, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Ziznovsky, Jozef
Adelman, Saul J
Weiss, Werner W
Language :
English
Title :
A search for radial magnetic field gradients in Ap atmospheres
Publication date :
01 December 2004
Event name :
The A-Star Puzzle
Event organizer :
J. Zverko, J. Ziznovsky, S.J. Adelman, and W.W. Weiss
Event place :
Poprad, Slovakia
Event date :
July 8-13, 2004
Audience :
International
Main work title :
The A-Star Puzzle
Editor :
Zverko, J.
Publisher :
Cambridge University Press,, Cambridge, United Kingdom
Collection name :
IAU Symposium, No. 224
Pages :
619-623
Commentary :
ISBN: <ISBN>0521850185</ISBN> 0521850185
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