Contact and near-contact binary systems. I - FT LUPI

Details Contact and near-contact binary systems. I - FT LUPI Contact and near-contact binary systems. I - FT LUPI

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208..135h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, May 1, 1984, p. 135-146. Research supported by the

Astronomy and Astrophysics

Astronomy

32

Eclipsing Binary Stars, Light Curve, Stellar Spectrophotometry, Variable Stars, Astronomical Catalogs, Mass To Light Ratios, Orbital Elements, Radial Velocity, Radii, Stellar Evolution, Stellar Magnitude, Stellar Models, Ubv Spectra

Scientific paper

Reticon spectroscopy and BVRI photometry are presented for the short-period eclipsing binary system FT Lup. Analysis of the V light curve, the radial velocity curves, and the BVRI colors shows that the system comprises a normal F2 V primary component and an intrinsically variable K2-5 V secondary component whose radius is approximately 65 percent larger than expected for its mass. The two stars are in marginal contact, but clearly without a common convective envelope. The properties of the system are in remarkable agreement with a theoretical model due to Webbink of evolution into contact.

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