Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...141..215c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 141, no. 1, Dec. 1984, p. 215-222.
Astronomy and Astrophysics
Astrophysics
13
Astronomical Photometry, B Stars, Early Stars, Stellar Spectrophotometry, A Stars, Atmospheric Models, Calibrating, H Lines, Spectral Energy Distribution, Spectral Line Width, Stellar Rotation
Scientific paper
The relations linking Geneva photometry with Stroemgren's beta index have been established for the O, B and early A-type stars via the reddening-free X, Y, Z parameter space of the Geneva system. An excellent estimate of beta is obtained by means of these essentially continuum-defined parameters. The beta (X, Y) estimator, when compared with the line-defined beta index, creates a new type of colour index which is highly sensitive to departures from a normal H-beta line width versus spectral energy distribution relationship. As a first application, an analysis is made of the consistency of rotating stellar models with observations, the internal consistency of model atmospheres by means of synthetic photometry, and the effects of emission in the hydrogen lines on such a composite index.
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