Four color UVBY photometry of near-contact semi-detached system TX Cassiopeiae

Details Four color UVBY photometry of near-contact semi-detached system TX Cassiopeiae Four color UVBY photometry of near-contact semi-detached system TX Cassiopeiae

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987acasn..28...71z&link_type=abstract

(Acta Astronomica Sinica, vol. 28, no. 1-4, 1987, p. 71-81) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 12, March

Astronomy and Astrophysics

Astrophysics

Eclipsing Binary Stars, Stellar Spectrophotometry, Ubv Spectra, Light Curve, Roche Limit, Stellar Color, Stellar Mass

Scientific paper

The early-type eclipsing binary TX Cas was observed in the Stromgen uvby system from October 1984 to January 1985. A total of 343 pairs of b and y observations, of which 126 include also u and v observations, were obtained covering the whole orbital phase with a new determination of period of 2.9268352 d. The colors at maximum light were v = 9.15, b-y = 0.33, m1 = -0.02, c1 = 0.27, and u-b = 0.90, and the reddening E(b-y) = 0.43. Using the Wilson-Devinney (1983) program, the v, b, and y light curves were analyzed simultaneously. This revealed TX Cas to be a near-contact, semidetached system, with the less massive component filling its Roche lobe and the more massive component nearly doing so. The photometric mass ratio was found to be 0.304 and the temperatures T1 = 24,500 K and T2 = 14,770 K. TX Cas probably consists of two early-type stars of spectral types B1.5 and B7. The system may be just past the common-envelope evolutionary stage of case B mass transfer.

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