Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...130...97l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 130, no. 1, Jan. 1984, p. 97-101.
Astronomy and Astrophysics
Astrophysics
12
Eclipsing Binary Stars, Light Curve, Stellar Evolution, Ubv Spectra, Iterative Solution, Stellar Spectrophotometry
Scientific paper
The UBV observations of UZ Oct are analyzed by means of the Wilson and Devinney's computational method. First, improved ephemeris are calculated and used to improve the determination of the phases. Then it is shown that neither 'detached' nor 'semi-detached' configurations can fit the observed light curves. The uniqueness of the solution is studied by starting several sets of differential correction iterations with different values of the main adjustable parameters. The short duration of the total eclipse at secondary minima makes the observations easily fit synthetic light curves with partial eclipses. In this way, three different solutions are found. When the configurations are forced to represent total occultations a single solution is obtained. The results are given in the form of two independent and convergent solutions. All the adjustable parameters including the mass-ratio and the secondary parameters seem to be very well defined. Finally, the evolutionary state of UZ Oct is deduced to be very close to the terminal age main sequence point. Probably it is one of the most evolved stars among the known W UMa contact binaries.
Lapasset Emilio
Sistero Roberto F.
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