The calibration of intrinsic colours in UVBY photometry

Details The calibration of intrinsic colours in UVBY photometry The calibration of intrinsic colours in UVBY photometry

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...219..121d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 219, no. 1-2, July 1989, p. 121-124. Research supported by the Direccion Gener

Astronomy and Astrophysics

Astrophysics

10

Open Clusters, Stellar Color, Stellar Spectrophotometry, Ubv Spectra, Visual Photometry, Interstellar Extinction, Stellar Magnitude

Scientific paper

On the basis of photoelectric uvby observations of NGC 1502 and NGC 2169 it is shown that the m0 and (u-b)0 values for early-type members of young open clusters critically depend on the set of standard stars selected to perform the transformation of instrumental to standard magnitudes. In particular, the values of these indices may contain large errors when the calibrations need to be extrapolated due to the cluster reddening. It is shown that these errors should be greatly reduced by using a calibration for (u-b), instead of m1.

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