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The gap of differential rotation in early F-type stars

Published online by Cambridge University Press:  18 July 2013

Matthias Ammler-von Eiff
Affiliation:
Thüringer Landessternwarte Sternwarte 5, 07778 Tautenburg, Germany email: ammler@tls-tautenburg.de Institut für Astrophysik, Georg-August-Universität Göttingen Friedrich-Hund-Platz 1, 37077 Göttingen, Germay email: areiners@astro.physik.uni-goettingen.de
Ansgar Reiners
Affiliation:
Institut für Astrophysik, Georg-August-Universität Göttingen Friedrich-Hund-Platz 1, 37077 Göttingen, Germay email: areiners@astro.physik.uni-goettingen.de
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Abstract

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We present new measurements of the rotational profile of 56 nearby stars of spectral types A-F obtained by line profile analysis. Together with earlier work, we now know of 33 stars in which Sun-like differential rotation was identified by line profile analysis. We find evidence of two populations of differential rotators, one group of rapidly rotating A stars at the granulation boundary with strong horizontal shear, and another group of mid- to late-F type stars with moderate rates of rotation and less shear. There is a gap between A and F stars, in which the stars appear to exhibit very little shear. Apparently, the physical conditions of differential rotation change at early-F spectral types.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2013 

References

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