Physics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2350...28f&link_type=abstract
In NASA. Ames Research Center Proc. of the Workshop on Improvement to Photometry p 28-32 (SEE N85-17892 08-89)
Physics
2
Doppler Effect, Spectrophotometers, Stars, Stellar Spectrophotometry, Fourier Transformation, Harmonic Analysis, Photons
Scientific paper
A spectrophotometer using the principle of optical resonance spectroscopy, designed for the goal of identifying radial and weakly non radial eigenmodes in the five minute range in the case of stars, is discussed. The conclusion of the first test of this new instrument was that if the observation can be photon noise limited (i.e., in total absence of any instrumental source of noise), the five-minute solar oscillation could still be detected by removing the Sun far enough for its magnitude to become zero or one. Such a situation is very closely represented by the observation of Alpha Centauri A, because it is a G2 V star, very similar to the Sun, with a mass of 1.1 in solar unit. Six nights were granted to this program on a 3.6m telescope, from 22 to 28 May 1983. Two and half nights provided over 20 hours of data of photometric quality good enough for analysis.
Fossat Eric
Gelly Bernard
Grec Gerard
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