Exploring the peculiar magnetic field of Feige 7

view Abstract Citations (51) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Exploring the Peculiar Magnetic Field of Feige 7 Achilleos, N. ; Wickramasinghe, D. T. ; Liebert, James ; Saffer, Rex A. ; Grauer, A. D. Abstract 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. Publication: The Astrophysical Journal Pub Date: September 1992 DOI: 10.1086/171715 Bibcode: 1992ApJ...396..273A Keywords: 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; Astrophysics; STARS: INDIVIDUAL NAME: FEIGE 7; STARS: MAGNETIC FIELDS; STARS: WHITE DWARFS full text sources ADS | data products SIMBAD (1)