Affiliation:
1. Lomonosov Moscow State University
2. Sternberg Astronomical Institute, Moscow State University
Abstract
The results of modeling the dependence of the «red leak» of photometric filters on various factors (color index
𝑉 −𝑅, luminosity class, interstellar reddening, air mass and PWV) during observations of stars are presented.
The error arising from not taking into account the «red leak» in the case of filters used on the 0.6-m telescope
of the CMO SAI can amount to 0.6
𝑚 − 0.8
𝑚 for late stars. Algorithms for reducing observational data are
presented for filters 𝑈 and 𝐵. The results of observations of the rapid variability of two symbiotic stars CH Cyg
and SU Lyn with cold components of very late spectral types are presented. For CH Cyg, rapid variability
was detected on both observation dates. Taking into account the «red leak» effect, the amplitude in the 𝐵
band was 0.10𝑚 on November 6, 2019 and 0.19𝑚 on December 15, 2022, with a characteristic variability time
of about 20 minutes. For SU Lyn, no rapid brightness variability was detected in the 𝐵 band on February 2,
2023 (with an accuracy of 0.003𝑚)
Funder
Russian Science Foundation
Subject
Space and Planetary Science,General Physics and Astronomy,Astronomy and Astrophysics
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