Chemically peculiar A stars and accretion of grains

Details Chemically peculiar A stars and accretion of grains Chemically peculiar A stars and accretion of grains

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....75..197h&link_type=abstract

Astronomy and Astrophysics, vol. 75, no. 1-2, May 1979, p. 197-203.

Astronomy and Astrophysics

Astrophysics

9

A Stars, Cosmic Dust, Stellar Mass Accretion, Electromagnetic Fields, Equations Of Motion, Stellar Magnetospheres, Stellar Temperature

Scientific paper

Grain accretion in chemically peculiar (CP) stars is studied. Grains which approach the star may evaporate within distances corresponding to the magnetosphere radii of such stars whereby the evaporated atoms are captured if they are, or become, ionized. The size and density limits above which grains approach the star depends on the stellar temperature and the grain absorption efficiency. Comparatively large and dense grains are favored at the effective temperatures of CP stars. The dynamical problem of the interaction of charged grains with the electromagnetic field of the stellar magnetosphere is examined. If positively and negatively charged grains encounter the magnetosphere at the same time, an angle between the rotational axis and the magnetic dipole of about 90 deg would be the most favorable for grains to enter the magnetosphere and stay there for an appreciable time. If this grain accretion process is to be important in accretion, a major fraction of a given element must be locked in grains with comparable densities to that of iron and with radii above about 1 micron at stellar temperatures of 14,000 K.

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