Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....54..137l&link_type=abstract
Astronomy and Astrophysics, vol. 54, no. 1, Jan. 1977, p. 137-158.
Astronomy and Astrophysics
Astrophysics
212
Astronomical Photometry, Cepheid Variables, Interstellar Extinction, Main Sequence Stars, Stellar Spectrophotometry, Subdwarf Stars, Abundance, Atmospheric Models, G Stars, Heavy Elements, Stellar Luminosity, Stellar Spectra
Scientific paper
The Walraven five-channel (VBLUW) photometer has been used primarily to study Cepheids and RR Lyrae variables. Those properties of the VBLUW photometric system are discussed which are important for analyzing and interpreting data on such stars. The standard stars that define the system are examined, the long-term stability of these stars is examined, and the responses of the photometric passbands are analyzed. Corrections for atmospheric extinction and interstellar reddening are reviewed, noting that color terms in the extinction corrections are sufficiently small to be neglected and that nonlinear terms in reddening corrections can also be neglected provided the reddening is not higher than about 1.25 magnitudes. Application of the VBLUW system to the classification of A, F, and G stars, Hyades main-sequence stars, bright field stars, and subdwarfs is demonstrated, and observed two-color diagrams are compared with theoretical diagrams based on model atmospheres. It is concluded that a three-dimensional classification based on effective temperature, surface gravity, and heavy-element abundance is possible for A, F, and G spectral types and that VBLUW photometry is more than twice as sensitive as Stroemgren uvby photometry to differences in heavy-element abundances below 8000 K.
Lub Jan
Pel Jan Willem
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