Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...297..127h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 297, no. 1, p. 127-134
Astronomy and Astrophysics
Astrophysics
28
Eclipsing Binary Stars, O Stars, Stellar Evolution, Stellar Models, Stellar Spectra, Variable Stars, Astronomical Photometry, Radial Velocity, Star Formation, Stellar Luminosity, Stellar Mass, Stellar Temperature
Scientific paper
Absolute dimensions for the detached O-type eclipsing binary Y Cygni are derived, based on analysis of new Reticon spectra and existing photometric data. For the primary (larger) and secondary (smaller ) stars respectively, we adopt the following dimensions m/solar mass = 17.5 +/- 0.4 and 17.3 +/- 0.3, R/solar radius = 6.0 +/- 0.3, and log L/solar luminosity = 4.47 +/- 0.12 and 4.45 +/- 0.1. Both components are shown to have equal temperatures of 31000 +/- 2000 K although we recognize that there remains a problem with the O star effective temperature scale and that these values may be 2000 K too low. Because of this we avoided using log Te in making the comparison with recent convective overshooting models. Y Cygni is a very young system, with an age of approximately 2-3 x 106 yr. These models also provide an apsidal motion constant log (bar -k)2 = 1.933 in excellent agreement with the observed value of -1.94 +/- 0.03.
Hill Gary
Holmgren D. E.
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