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Observational signatures of atmospheric velocity fields in Main Sequence stars

  • F. Kupka (a1) (a2), J. D. Landstreet (a3) (a2), A. Sigut (a3) (a2), C. Bildfell (a3) (a4), A. Ford (a3) (a5), T. Officer (a3), J. Silaj (a3) and A. Townshend (a3) (a2)...

Abstract

In stars with sufficiently small projected rotational velocities (less than a few ${\rm km\,s}^{-1}$), it is often possible to detect signatures of the atmospheric velocity field in line profiles. These signatures may be as subtle as small asymmetries in the profile (“line bisector curvature”) or as obvious as profile shapes that strongly depart from those predicted by simple microturbulence models. We have recently carried out a high resolution survey of sharp-line stars to search for these symptoms of local velocity fields. We report the first results of a comparison of models with the observed profiles.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

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Observational signatures of atmospheric velocity fields in Main Sequence stars

  • F. Kupka (a1) (a2), J. D. Landstreet (a3) (a2), A. Sigut (a3) (a2), C. Bildfell (a3) (a4), A. Ford (a3) (a5), T. Officer (a3), J. Silaj (a3) and A. Townshend (a3) (a2)...

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