New intrinsic-colour calibration for $uvby$--$β$ photometry

Details New intrinsic-colour calibration for $uvby$--$β$ photometry New intrinsic-colour calibration for $uvby$--$β$ photometry

2009-12-04

arxiv.org/abs/0912.0793v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

18 pages, 3 figures, accepted to New Astronomy

Scientific paper

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 Equation (1), has been based upon stars with $d_{Hip} < 70$ pc in the photometric catalogues of Schuster et al. (1988, 1993, 2006), provides a small dispersion, $\pm0.009$, and has a positive ``standard'' $+2.239\Delta\beta$ coefficient, which is not too different from the coefficients of Crawford (+1.11; 1975a) and of Olsen (+1.34; 1988). For 61 stars with spectra from CASPEC, UVES/VLT, and FIES/NOT databases, without detectable Na I lines, the average reddening value $ = -0.001\pm0.002$ shows that any zero-point correction to our intrinsic-colour equation must be minuscule.

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