Astronomy & Astrophysics manuscript no. diffrot c ESO 2018 November 1, 2018 New measurements of rotation and differential rotation in A-F stars: Are there two populations of differentially rotating stars? ⋆⋆⋆ Ammler-von Eiff, M.1,2,3 and Reiners, A.2 1 Th¨uringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany e-mail:
[email protected] 2 Institut f¨ur Astrophysik, Georg-August-Universit¨at G¨ottingen, Friedrich-Hund-Platz 1, 37077 G¨ottingen, Germany e-mail:
[email protected] 3 Max Planck Institute for Solar System Research, Max-Planck-Straße 2, 37191 Katlenburg-Lindau, Germany Received September 15, 1996; accepted March 16, 1997 ABSTRACT Context. The Sun displays differential rotation that is intimately connected to the solar dynamo and hence related to solar activity, the solar cycle, and the solar wind. Considering the detectability and habitability of planets around other stars it is important to understand the role of differential rotation in other stars. Aims. We present projected rotational velocities and new measurements of the rotational profile of some 180 nearby stars with spectral types A-F. The results are consolidated by a homogeneous compilation of basic stellar data from photometry and the identification of multiple stellar systems. New and previous measurements of rotation by line profile analysis are compiled and made available. Methods. The overall broadening profile is derived analysing spectral line shape from hundreds of spectral lines by the method of least-squares deconvolution, reducing spectral noise to a minimum. The effect of differential rotation on the broadening profile is best measured in inverse wavelength space by the first two zeros of its Fourier transform.