Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.120..167k&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 120, no. 2, March 1986, p. 167-189.
Astronomy and Astrophysics
Astrophysics
24
Apsides, Eclipsing Binary Stars, Stellar Motions, Stellar Orbits, Chronology, Eccentric Orbits, Main Sequence Stars, Stellar Evolution
Scientific paper
A comprehensive period study of the times of minima observed from 1881 to 1985 has been performed. Previous interpretations of the O-C diagram based on light-time effect are confirmed. The light-time orbit of U Oph has been revised during a differential corrections procedure. An eccentric orbit with e-prime = 0.22 + or - 0.06, P-prime = 38.7 + or - 0.2 yr, and a mass function f(m) = 0.0044 + or - 0.0005 solar masses, are obtained. In addition, the analysis has revealed short-period apsidal motion (U/P = 4515 + or - 75) in a slightly eccentric close orbit (e = 0.0031 + or - 0.0003), allowing a reliable determination of the density concentration coefficient as 0.0059 + or - 4. A comparison with stellar evolutionary models calculated by Jeffery (1984) yields the helium content Y = 0.28 + or - 0.05 and an age of 30 milllion yr for the components of U Oph.
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