Magnetic fields and diffusion processes in peculiar A stars. II - Precession and the oblique rotator model

Abstract

view Abstract Citations (38) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Magnetic fields and diffusion processes in peculiar A stars. II. Precession and the oblique rotator model. Shore, S. N. ; Adelman, S. J. Abstract A global view of magnetic-field structure as it pertains to the nature and general properties of the phenomenon of spectrum variability of peculiar A stars is formulated in the context of the magnetic diffusion mechanism. Arguments relating to the stability of starspots are given in terms of the magnetic field and rotation. Some observational tests are suggested. The magnetic field is shown to cause departures of the star from sphericity, and this results in long-term free-body precession for Ap stars of the shortest rotational periods. The effect of a close companion on such a star is examined briefly. Observed consequences and problems are discussed. Publication: The Astrophysical Journal Pub Date: November 1976 DOI: 10.1086/154779 Bibcode: 1976ApJ...209..816S Keywords: A Stars; Magnetic Stars; Stellar Magnetic Fields; Companion Stars; Precession; Spectral Line Width; Starspots; Stellar Envelopes; Stellar Rotation; Stellar Spectra; Astrophysics full text sources ADS | data products SIMBAD (10)