The distribution of silicon on BP Boo

Details The distribution of silicon on BP Boo The distribution of silicon on BP Boo

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.245...56h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 245, July 1, 1990, p. 56-65.

Astronomy and Astrophysics

Astronomy

14

A Stars, Maximum Entropy Method, Peculiar Stars, Silicon, Stellar Composition, Stellar Magnetic Fields, Astronomical Photometry, Diffusion Theory, Line Spectra, Magnetic Poles, Stellar Spectra

Scientific paper

A version of the Doppler imaging technique which incorporates the principles of maximum entropy reconstruction is used to derive the silicon distribution on the Ap star BP Boo (HR 5857). The method used made it possible to detect an error in the published photometric period, and a new value of 1.29557 d was determined. The silicon distribution consists of two depleted spots of unequal area separated by about 180 deg in longitude. These spots may coincide with the location of the magnetic poles of the star. Near the larger of the depleted silicon spots is a spot of enhanced abundance. The unequal area of the depleted spots as well as the close proximity of the enhanced spot to one of the depleted regions suggested the presence of nonaxisymmetric magnetic field lines.

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