Contact and near-contact binary systems - I. FT Lupi
Open Access
- 1 May 1984
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 208 (1) , 135-146
- https://doi.org/10.1093/mnras/208.1.135
Abstract
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 ∼ 65 per cent 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.Keywords
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