Abstract
ABSTRACT EVRIS is the first space experiment dedicated to asteroseismology. It will be launched on board the MARS 96 Russian spacecraft in November 1996. The main goal of the experiment is to detect solar-like oscillations in main sequence stars, with relative amplitudes of a few ppm. The detector is a multiplier phototube working in counting mode. To reach the necessary sensitivity, it will work at a very high counting rate (> 106 counts s-1). The instrumental perturbations on the signal must be kept at one tenth of the photon noise level. This paper describes experiments and calibrations showing that the unavoidable limitation of the photon noise can be obtained in these conditions, for frequencies higher than 0.1 mHz. A nine-day experiment gives a reliable estimate of the true noise level in Fourier space.
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