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A.-L. Lesage

Research: Determination of the Position Angle of the Rotation axis of stars,

The mechanisms of planet formation is still subject to several theories. Either the planets are issued from the remaining accretion disk of the star, or they are formed from the confrontation of a nearby gas cloud. Thus, measuring the Position Angle of the stellar rotation axis would permit a verification of either theory. With the high resolution spectrometers available, it is theoretically possible to measure the small variations in the width of the spectral line. The maximal elongation is reached once the entrance slit of the spectrometer is aligned with the rotation axis. However this process takes time, during which atmosphere and instruments characteristics change. The instrument shall perform a light beam division, the rotation of one beam around the optic axis, and finally recombine these beams for an simultaneous measured at different rotations.