DOPPLER-ZEEMAN MAPPING OF THE MAGNETIC CP STAR HD-215441

Citation
Vl. Khokhlova et al., DOPPLER-ZEEMAN MAPPING OF THE MAGNETIC CP STAR HD-215441, Astronomy letters, 23(4), 1997, pp. 465-482
Citations number
16
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
10637737
Volume
23
Issue
4
Year of publication
1997
Pages
465 - 482
Database
ISI
SICI code
1063-7737(1997)23:4<465:DMOTMC>2.0.ZU;2-T
Abstract
The method of Vasilchenko et al. (1996) is used to obtain a Doppler-Ze eman map of the magnetic CP star HD 215441. The magnetic held is appro ximated by a magnetic dipole that is arbitrarily shifted from the star center. The solution of the inverse problem yields the dipole paramet ers and the maps of Si, Ti, Cr, and Fe abundance anomalies; the coordi nates of local magnetic vectors on the star surface are computed. A co mparison of the distribution of abundance anomalies and the magnetic-f ield configuration reveals that in the region where the magnetic-held lines are vertical (near the magnetic pole), Si. Ti and Cr are highly deficient, while the Fe enhancement is strongest. In the regions where the magnetic-held lines are horizontal (near the magnetic equator), S i, Ti and Cr show the greatest overabundance. In these regions, the Fe abundance is also slightly enhanced and exhibits, as it were, a secon dary maximum. The factors that Limit the accuracy of Doppler-Zeeman ma pping are reviewed.