Have Non-Magnetic Stars a Complex Geometry?
نویسندگان
چکیده
منابع مشابه
Diffusion in non-magnetic stars and COROT
New developments in the modeling of non-magnetic non-rotating A stars have had a major impact on our understanding of the formation of abundance anomalies in these stars. The great sensitivity of the pulsational properties as well as of the observable chemical composition to the internal mixing processes in chemically peculiar stars make these objects potentially important tools to investigate ...
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Stars are, generically, rotating and magnetised objects with a misalignment between their magnetic and rotation axes. Since a magnetic field induces a permanent distortion to its host, it provides effective rigidity even to a fluid star, leading to bulk stellar motion which resembles free precession. This bulk motion is however accompanied by induced interior velocity and magnetic field perturb...
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Magnetic fields are present in a wide variety of stars throughout the HR diagram and play a role at basically all evolutionary stages, from very-low-mass dwarfs to very massive stars, and from young star-forming molecular clouds and protostellar accretion discs to evolved giants/supergiants and magnetic white dwarfs/neutron stars. These fields range from a few μ G (e.g., in molecular clouds) to...
متن کاملNon-dipolar magnetic fields in Ap stars
An arbitrary initial magnetic field in an A star evolves into a stable equilibrium. Simulations are presented of the formation of non-axisymmetric equilibria consisting of twisted flux tubes meandering under the surface of the star, and analytic arguments are given relating the stability and form of these equilibria. These results may help to explain observations of Ap stars with very non-dipol...
متن کاملOn non-axisymmetric magnetic equilibria in stars
In previous work stable approximately axisymmetric equilibrium configurations for magnetic stars were found by numerical simulation. Here I investigate the conditions under which more complex, non-axisymmetric configurations can form. I present numerical simulations of the formation of stable equilibria from turbulent initial conditions and demonstrate the existence of non-axisymmetric equilibr...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1993
ISSN: 0252-9211
DOI: 10.1017/s0252921100020686