The rotation effect - A mechanism for measuring granulation velocities in stars

Details The rotation effect - A mechanism for measuring granulation velocities in stars The rotation effect - A mechanism for measuring granulation velocities in stars

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..319g&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, March 1986, p. 319-324. NSERC-supported research.

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Doppler Effect, Photosphere, Stellar Activity, Stellar Rotation, Stellar Spectra, Computational Astrophysics, F Stars, Line Spectra, Starspots, Velocity Measurement

Scientific paper

The Doppler effects of stellar granulation, when combined with those of the star's rotation, have been predicted to enhance the asymmetries in spectral line profiles, a process referred to as the rotation effect. A dozen F stars were observed for the rotation effect. The effect is seen in some, but not all, of them. The asymmetries, as expressed in the line bisectors, are compared to numerical simulations from which it is possible to obtain the average velocity of rise of the hot granules on an absolute velocity scale. Values ≡ -1.5 to -3.0 km s -1 are deduced.

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