Exploring the peculiar magnetic field of Feige 7

Details Exploring the peculiar magnetic field of Feige 7 Exploring the peculiar magnetic field of Feige 7

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...396..273a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 396, no. 1, Sept. 1, 1992, p. 273-288. Research supported by Department of

Astronomy and Astrophysics

Astrophysics

39

Magnetic Stars, Peculiar Stars, Signal To Noise Ratios, Stellar Magnetic Fields, Stellar Spectra, White Dwarf Stars, Absorption Spectra, Astronomical Models, Line Spectra, Stellar Rotation, Zeeman Effect

Scientific paper

Time-resolved high signal-to-noise intensity spectra are presented for the magnetic white dwarf Feige 7. On the basis of these data and by using computer models for magnetic stars it is shown that the magnetic field in Feige 7 cannot be represented by a centered dipole geometry. A good approximation to the field is a dipole of strength 35 MG displaced by 0.15 white dwarf radii from the stellar center, viewed at different angles as the star rotates. It is necessary to use a model with variable surface abundances of hydrogen and helium to reproduce the variation, due to stellar rotation, in the Zeeman absorption lines of these elements.

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