Abstract: In this article, we discuss the importance of estimating the extinction coefficients for different pass-band filters in the stellar photometry. As the stellar brightness measured by ground based telescopes is reduced due to the scattering and absorption by the atmosphere of the Earth, the extinction correction is required to overcome such attenuation in the stellar brightness. Because of this fact, we also describe the procedure of determining the extinction coefficients for B and V pass-band filters using the CCD images of the Landolt’s standard stars field PG2331+055, which are provided by the Skinakas Observatory. Since the extinction coefficients are estimated by the slope of the graph between the airmass and instrumental magnitudes of a standard star marked as ‘A’ in the field PG2331+055, the stellar magnitudes are calculated by performing the aperture photometry on this standard star ‘A’ whose CCD images were observed in the same night over a wide range of airmass. It is found here that the effect of atmospheric extinction is less in V-filter than in B-filter.
Keywords: Atmospheric coefficients – methods: observations and data analysis – technique: CCD photometry.
Title: Importance of Estimating Extinction Coefficients in Stellar Photometry
Author: Swadesh Chand, Parijat Thakur, Abhijit Mandal
International Journal of Mathematics and Physical Sciences Research
ISSN 2348-5736 (Online)
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