A Photometric Analysis of the Binary System KO Aquilae

We report photometric uvbyoi observations of the variable KO Aql obtained during the summer of 1993. One time of primary minimum was observed, and improved quadratic and linear ephemerides were calculated. Eclipse timings of KO Aql, spanning over a sixty-year interval, show that the system is underg...

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Bibliographic Details
Published in:Publications of the Astronomical Society of the Pacific 1996-05, Vol.108 (723), p.404-407
Main Authors: Mader, Jeff A., Angione, Ronald J.
Format: Article
Language:English
Subjects:
Astronomical photometry
Companion stars
Comparison stars
Ephemerides
Main sequence stars
Mass ratio
Mathematical minima
Optical filters
Stars
Stellar classification
Stellar masses
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Description
Summary:We report photometric uvbyoi observations of the variable KO Aql obtained during the summer of 1993. One time of primary minimum was observed, and improved quadratic and linear ephemerides were calculated. Eclipse timings of KO Aql, spanning over a sixty-year interval, show that the system is undergoing a period increase of 1.7 (±0.1) X10⁻⁸ days/cycle. Analysis of our photometry with the new Wilson eclipsing-binary computer program indicates that the mass ratio of the system is 0.29 and that the secondary star is cooler than the previously determined G0 spectral type. The masses and radii of the two components are also estimated.
ISSN:0004-6280
1538-3873
DOI:10.1086/133740