BVR, Potsdam, and Harvard Photometries

Details BVR, Potsdam, and Harvard Photometries BVR, Potsdam, and Harvard Photometries

Dec 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969bott....5..111m&link_type=abstract

Boletín de los Observatorios de Tonantzintla y Tacubaya Vol. 5, pp. 111-179 (1969) (http://www.astroscu.unam.mx/~bott/)

Astronomy and Astrophysics

Astronomy

1

Photometry

Scientific paper

Multiple Regression Analysis has been used to find equations to transform Potsdam (Müller and Kempf, 1907) and Harvard (Pickering, 1908) visual photometries into the BVR photoelectric system (Johnson and Mitchell, 1962). The results indicate that the transformations are good. They strongly depend on the colors (B-V or V-R). The dependence on Pogson scale deviation and Purkinje effect is not large. However, if these coefficients are absent in the formulae (Ideal Systems), then the residuals are not distributed at random in the (magnitude, residuals)-plane, specially at both ends. If a sample of magnitudes is divided in zones according to the stellar right ascension or declination, then the results are somewhat different than those that include all R. A. and Dec. The Harvard photo­metry has a zero point closer to that of the BVR-system than Potsdam's. However, the latter is more uniform than the former. In most cases probably the B-V color gives slightly better results than V-R.

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