Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98.1303b&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Dec. 1986, p. 1303-1311.
Astronomy and Astrophysics
Astronomy
103
Astronomical Photometry, Color-Magnitude Diagram, M Stars, Stellar Spectra, Visual Photometry, Astronomical Photography, Bandpass Filters, Charge Coupled Devices, Stellar Spectrophotometry
Scientific paper
The Kron-Cousins R band has an extended red tail which, for M stars, causes large nonlinear differences between the standard R magnitudes and those measured using IIIa-F plates, or CCDs with rectangular passband filters. Accurate zero-point calibration of the nonstandard magnitudes can be made by using cubic transformations to convert the standard magnitudes of the calibrating stars into magnitudes that are linear in the natural system. Exact inverse transformations from the natural system will provide standard magnitudes and colors for stars of most spectral types. This discussion is supplemented by a note about B and V photometry with IIIa-J and IIIa-F plates and CCD detectors.
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