The oblique rotator model - Discussion of Deutsch and Khokhlova methods

Details The oblique rotator model - Discussion of Deutsch and Khokhlova methods The oblique rotator model - Discussion of Deutsch and Khokhlova methods

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....71..295m&link_type=abstract

Astronomy and Astrophysics, vol. 71, no. 3, Jan. 1979, p. 295-304.

Astronomy and Astrophysics

Astrophysics

10

A Stars, Abundance, Magnetic Stars, Spatial Distribution, Stellar Models, Astronomical Maps, Line Spectra, Radial Velocity, Silicon, Spectral Line Width, Stellar Rotation

Scientific paper

The element distributions for Ap stars obtained by means of Deutsch's (1958, 1970) and Khokhlova's (1975, 1976) methods on the assumption of an oblique rotator are compared. The two methods are tested by considering two arbitrary and simple distributions of Si II on a stellar surface: in two spots on opposite sides of the equator with Si overabundant by a factor of 100 and in six spots on the visible disk with the same Si overabundance. The uniqueness of the element distribution determined by each of the two methods is evaluated, and the maximum number of detectable spots is shown to be six for a spectral dispersion of at least 12 A/mm. The two methods are applied to spectra of the Ap stars Chi Ser and 108 Aqr. The results indicate that the two methods yield the same spot longitudes with good precision, but the spot latitudes differ significantly. It is concluded that the distribution obtained by either method is not unique, since only the number and longitudes of spots are well defined.

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