Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasp..109..140b&link_type=abstract
Publications of the Astronomical Society of the Pacific, v.109, p.140-150
Astronomy and Astrophysics
Astronomy
5
Instrumentation: Photometers, Stars: Oscillations
Scientific paper
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 (> 10superscript6 counts s superscript-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. (SECTION: Astronomical Instrumentation)
Auvergne Michel
Buey Jean Tristan
Epstein Gabriel
Vuillemin André
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