Stellar luminosities and radii from uvby-beta photometry

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Photometry, Radii, Stellar Luminosity, Ubv Spectra, Giant Stars, Late Stars, Stellar Magnitude, Supergiant Stars

Scientific paper

A linear relation is found to exist between the Barnes-Evans visual surface brightness parameter Fv and the (b-y)0 colour index of uvbyβ photometry for spectral types later than G0. Using this relation, and a previously determined relation for spectral types B0 - G0, tables of intrinsic colours and indices, absolute magnitude and stellar radius are given for the ZAMS and luminosity classes Ia - V over a wide range of spectral types. Comparison of absolute magnitudes and radii calculated from uvbyβ photometry with values obtained using the visual magnitude, parallax and angular diameter indicates that uvbyβ photometry can be used to determine Mv to ±0m.2 and log(R/R_sun;) to ±0.05.

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