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Observational signatures of atmospheric velocity fields in Main Sequence stars

Published online by Cambridge University Press:  02 March 2005

F. Kupka ,
J. D. Landstreet ,
A. Sigut ,
C. Bildfell ,
A. Ford ,
T. Officer ,
J. Silaj  and
A. Townshend
F. Kupka
Affiliation:
Max-Planck-Institut für Astrophysik, Garching, Germany email: fk@mpa-garching.mpg.de Canada-France-Hawaii-Telescope, which is operated by the Centre National de Recherche Scientifique of France, the National Research Council of Canada, and the University of Hawaii.
J. D. Landstreet
Affiliation:
Department of Physics & Astronomy, University of Western Ontario, London, ON, Canada email: jlandstr@astro.uwo.ca; asigut@despot.astro.uwo.ca Canada-France-Hawaii-Telescope, which is operated by the Centre National de Recherche Scientifique of France, the National Research Council of Canada, and the University of Hawaii.
A. Sigut
Affiliation:
Department of Physics & Astronomy, University of Western Ontario, London, ON, Canada email: jlandstr@astro.uwo.ca; asigut@despot.astro.uwo.ca Canada-France-Hawaii-Telescope, which is operated by the Centre National de Recherche Scientifique of France, the National Research Council of Canada, and the University of Hawaii.
C. Bildfell
Affiliation:
Department of Physics & Astronomy, University of Western Ontario, London, ON, Canada email: jlandstr@astro.uwo.ca; asigut@despot.astro.uwo.ca Present address: University of Victoria, Victoria, BC, Canada
A. Ford
Affiliation:
Department of Physics & Astronomy, University of Western Ontario, London, ON, Canada email: jlandstr@astro.uwo.ca; asigut@despot.astro.uwo.ca Present address: Swinburne University of Technology, Melbourne, Victoria, Australia
T. Officer
Affiliation:
Department of Physics & Astronomy, University of Western Ontario, London, ON, Canada email: jlandstr@astro.uwo.ca; asigut@despot.astro.uwo.ca
J. Silaj
Affiliation:
Department of Physics & Astronomy, University of Western Ontario, London, ON, Canada email: jlandstr@astro.uwo.ca; asigut@despot.astro.uwo.ca
A. Townshend
Affiliation:
Department of Physics & Astronomy, University of Western Ontario, London, ON, Canada email: jlandstr@astro.uwo.ca; asigut@despot.astro.uwo.ca Canada-France-Hawaii-Telescope, which is operated by the Centre National de Recherche Scientifique of France, the National Research Council of Canada, and the University of Hawaii.
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Abstract

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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

Keywords

Convectiontechniques: spectroscopicline: profilesstars: atmospheresstars: individual (HD 103578, HD 147084, HD 160762, HD 175640, HD 185395)stars: rotation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS224 , July 2004 , pp. 573 - 579
Copyright
© 2004 International Astronomical Union