Revised photometric elements of the eclipsing binary BR CYG

Details Revised photometric elements of the eclipsing binary BR CYG Revised photometric elements of the eclipsing binary BR CYG

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....96..409g&link_type=abstract

Astronomy and Astrophysics, vol. 96, no. 1-2, Mar. 1981, p. 409-411. Research supported by the Consiglio Nazionale delle Ricerc

Astronomy and Astrophysics

Astrophysics

1

Eclipsing Binary Stars, Light Curve, Stellar Models, Stellar Spectrophotometry, Variable Stars, Electrophotometers, Limb Darkening, Stellar Evolution, Stellar Luminosity, Stellar Mass, Stellar Temperature

Scientific paper

Using Wood's (1972) model we have analyzed Harmanec et al.'s (1973) three-colour photoelectric observations - as yet unsolved - of the eclipsing binary BR Cyg and Wehinger's (1968) two-colour photoelectric lightcurves. Our photoelectric elements differ considerably from Wehinger's previous solution. The early A primary appears to be accompanied by a fainter G secondary of nearly equal size; this cooler member fills its Roche lobe for our photometric mass ratio q = 0.4. The absolute elements, of BR Cyg, tentatively estimated by assuming for the primary a mass of 2.5 Msun, reveal that the secondary is distinctly oversized and overluminous for its mass and spectral type, as are common subgiant secondaries of Algols.

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