New intrinsic-colour calibration for uvby-beta photometry

Abstract

A new intrinsic-colour calibration ((b - y)(o) - beta) is presented for the uvby-beta photometric system, making use of re-calibrated Hipparcos parallaxes and published reddening maps. This new calibration for (b - y)(o) - beta, our Eq. (1), has been based upon stars with d(Hip) = -0.001 +/- 0.002 shows that any zero-point correction to our intrinsic-colour equation must be minuscule. (C) 2009 Elsevier B.V. All rights reserved.