Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..185l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 1, 185-201
Astronomy and Astrophysics
Astrophysics
18
Astronomical Photometry, Eclipsing Binary Stars, O Stars, Stellar Luminosity, Stellar Mass, Stellar Spectra, Ultraviolet Spectroscopy, Astronomical Models, Light Curve, Radial Velocity, Radiation Pressure
Scientific paper
New spectroscopic and photometric results for the eclipsing binary AB Cru are presented. The first photoelectric UBV light curves of this O8-type system were solved with a newly developed light curve modeling code taking into account radiation pressure effects due to the mutual irradiation of the binary components. The radiative forces exerted on the irradiated surface layers reach a few percent of the gravitational attraction of the companion, and have non-negligible influence on the binary structure. The first radial velocity curve of AB Cru, based on high resolution Coude-Echelle spectra, allowed for an accurate determination of the spectroscopic mass ratio and the radial velocity amplitudes. For the first time, precise absolute dimensions of AB Cru can be given: the stellar masses for the primary and secondary component are 19.75 and 6.95 solar mass, the radii 10.54 and 8.85 solar radius, and luminosities 1.64 105 and 3.84 104 solar mass. A semi-detached system configuration was found. The evolutionary state of AB Cru is discussed; both stellar components are slightly evolved, but still located within the upper main sequence band. Strong indications for case A mass transfer from the secondary towards the primary are found, suggesting that AB Cru has formerly undergone a reversal of its mass ratio.
Drechsel Horst
Lorenz Reinald
Mayer Pavel
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