Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jrasc..80..240l&link_type=abstract
Journal of the Royal Astronomical Society of Canada (ISSN 0035-872X), vol. 80, Oct. 1986, p. 240-256. NSERC-supported research.
Astronomy and Astrophysics
Astronomy
10
Astronomical Photometry, Cepheid Variables, Companion Stars, Early Stars, Brightness, Emission Spectra, Spectrum Analysis, Stellar Color
Scientific paper
A method for determining the characteristics of early-type companions to classical Cepheids using Stroemgren photometry is described. The method uses the slopes of the mean lines of the Cepheid's m(1) vs (b - y) and c(1) vs (b - y) color-color loops to determine the brightness and spectral type of the companion. The photometry of Feltz and McNamara (1980) was used to estimate the characteristics of the companions to Eta Aql, U Aql, SU Cas, SU Cyg, and AW Per. The existence of these early-type companions has been established by duplicity studies in the past. The newly derived companion characteristics are in rough agreement with published results.
Leonard Peter J. T.
Turner David G.
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