Physics – Optics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268..369p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 1, p. 369-373.
Physics
Optics
29
Astronomical Photometry, Atmospheric Optics, Extinction, Space Observations (From Earth), Data Processing, Power Spectra, Statistical Analysis
Scientific paper
Observational evidence was found that even in good photometric sites the extinction coefficient can display large variations during a night. If not corrected, this variability increases the measurement errors and introduces low-frequency spurious peaks in the power spectra. In order to apply the procedures based on the instantaneous determination of the extinction coefficient, an analytical method is proposed to determine a reliable value for the extra-atmosphere instrumental magnitude for a reference star. The whole process was applied to different couples of stars and the improvements in the frequency analysis with respect to classical procedures are emphasized. It allowed us to better extract a small amplitude signal in presence of a rapid variability of the atmospheric extinction coefficient and to obtain a clear picture of the extinction coefficient at La Silla during September and October 1991.
Poretti Ennio
Zerbi Filippo
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