Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..413k&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, no. 676, June 1992, p. 413-434. Research supported
Astronomy and Astrophysics
Astronomy
126
Astronomical Photometry, Stellar Magnitude, Stellar Oscillations, Double Stars, Electrophotometers, Point Spread Functions, Precision, Signal To Noise Ratios, Temporal Resolution
Scientific paper
High-precision time-resolved photometry and detection of low-amplitude stellar oscillations are limited in precision by many factors. The noise terms for a typical time-series observation contain observational noise and errors as well as instrumental noise and reduction noise. This paper describes some of the problems related to high-precision photometry, especially focusing on CCD photometry both on focused stars (in semi- and noncrowded fields) and defocused field stars. It is shown that atmospheric transparency variations and instrumental drift are the main noise sources at low frequencies (below 1-2 mHz), and that CCD photometry is the best way of doing differential measurements in order to detect oscillations at low frequencies. The theoretical description of noise and problems in high-precision photometry is compared with CCD time-series observations in a noncrowded test field observed with the Danish 1.5-m telescope at ESO La Silla, Chile in 1990. In addition, observations of defocused double stars observed with the Nordic Optical Telescope in 1991 are described.
Frandsen Soren
Kjeldsen Hans
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