Publications of the MPIfR
Optical & Infrared
Interferometry Group
Domiciano de Souza, A.; Zorec, J.;
Jankov, S.; Vakili, F.; Abe, L.; Janot-Pacheco, E.
Stellar differential rotation and inclination
angle from spectro-interferometry
Astronomy and Astrophysics, v.418, p.781-794 (2004)
Abstract
Differential interferometry (DI) is a technique that combines high
spectral resolution with high spatial resolution. It is particularly
suited to probe mechanisms that induce chromatic signatures, such as
large scale mass motions. We thus investigate the use of DI combined
with the Fourier transform method to study the stellar surface
differential rotation. We show that, compared to spectroscopy, DI has
the double advantage of allowing the use of all available Fourier
frequencies as well as of disentangling the stellar differential
rotation rate and the inclination angle. We derive some reference
analytical expressions of DI observables. It is shown that the foreseen
instrumental performances of the spectro-interferometer VLTI/AMBER are
high enough to study the stellar differential rotation.
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