Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...258..449b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 258, no. 2, p. 449-463.
Astronomy and Astrophysics
Astrophysics
66
A Stars, Magnetic Field Configurations, Peculiar Stars, Stellar Atmospheres, Stellar Mass Ejection, Stellar Winds, Abundance, Line Shape, Radiative Transfer, Stellar Magnetic Fields
Scientific paper
Precise abundance map determinations on the surface of Ap stars offer the possibility of a deep investigation of hydrodynamical processes in the atmospheric layers. We investigate the effect of a small and inhomogeneous mass outflow on the photospheric abundance of trace elements on 53 Cam. Since the photospheric abundance of Ca is very sensitive to mass loss rates, we model the wind using the observed Ca line profiles and then calculate without any further free parameters the photospheric abundances and line profiles of other observable elements. We thus obtain that the inhomogeneous wind model allows us to explain the spectral profiles and their time variations for Ca, Cr, Fe, and Sr simultaneously. The time variations of Mn and Ti lines are, however, not yet accounted for by this model. The derived wind inhomogeneities are well related to the observed magnetic structure and could be explained by a confinement of the wind by the magnetic field of 53 Cam. The mass loss rates determined by this model are of 3 x 10 exp -15 solar mass/yr near the magnetic poles of 53 Cam, a value five orders lower than the upper limit obtained by direct measurements.
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