Abstract
The RGU system was introduced by Becker [60] in 1946, well before the UBV system. However, it has been mainly used photographically and applied to stellar statistics research. The passbands are defined as follows:
U Filter Schott UG2 ( 2mm) + Agfa Astro
G Filter Schott GG5 (2mm) + Agfa Astro
R Filter Schott RG1( 2mm) + Agfa Isopan
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© 1974 D. Reidel Publishing Company, Dordrecht, Holland
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Golay, M. (1974). Multi-Colour and Wide-Band Photometry. In: Introduction to Astronomical Photometry. Astrophysics and Space Science Library, vol 41. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2169-2_4
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DOI: https://doi.org/10.1007/978-94-010-2169-2_4
Publisher Name: Springer, Dordrecht
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