Proceedings PaperDifferential Speckle Interferometry Imaging Of Spotted Stars
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Differential Speckle Interferometry (DSI) is a super-resolution technique, based on the combination of high angular and high spectral resolution, which makes it possible to measure the displacement of the photocenter of an astronomical object, as a function of wavelength, even if it is much smaller than the telescope Airy disk. When applied to rapidly rotating stars, DSI permits the determination of the stellar angular diameter and of the position angle and, sometimes, of the inclination of the stellar rotational axis. If the star is spotted, DSI provides a one dimensional image of the star integrated in the rotational axis direction and some information related to the latitude of the starspots. The study of the temporal variation of the DSI information combined with a Doppler Imaging analysis of the broad-band light curve and of the temporal behavior of the profile of temperature unsensitive absorption lines should make it possible to reconstruct two dimensional maps of the stellar surface. This reconstruction should be easier and more unique than that based on the Doppler Imaging technique alone. This communication is a very preliminary presentation of this technique.