By R. F. Griffin (auth.), P. P. Eggleton, J. E. Pringle (eds.)

Peter P. Eggleton and James E. Pringle Institute of Astronomy Madingley highway Cambridge England The 1970's could be defined, looking back, because the "Decade of the shut Binary". intriguing observations with new expertise, mixed with classical paintings, either observational and theoretical, confident the astronomical global that binary interplay of varied varieties is not just attention-grabbing yet universal. certainly, by means of 1975 nearly whatever strange had a superb opportunity of being interpreted as as a result of binary interplay. yet astronomers are seldom beaten through hypothesis, even their very own, and good observational paintings has proven or refuted such hypothesis, with no regard to its plausibility. for example, binarity has been came across the place it used to be probably least anticipated, in Barium stars, and refuted the place it may possibly such a lot kind of be anticipated, in Wolf-Rayets. regrettably, many different sessions of strength binaries stay with no the clearest proof of binarity, for example Be stars, symbiotics and blue stragglers. This complex research Institute was once held to commemorate John Whelan (1945-1981), whose medical profession, unfortunately minimize brief in its major, did a lot to additional the cautious learn, theoretical and observational, of shut binaries, in addition to to inspire the spirit of overseas friendship and collaboration. His personal pursuits coated a better box, yet "Interacting Binaries" appeared an affordable restrict. We post right here 15 evaluate talks, which nonetheless don't conceal the entire subject, even though they vary widely.

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11 . ~ . ~-:·~,·. ~ . .. 3 .. ",;. '. S .... ,... ~. 0 Phose Figure 3. Striking changes of the light curve of TZ Boo have been discovered by Hoffmann (1978a). 5 ( b-y ) Figure 4. The Sm. indices of W UMa systems in uvby photometry (Rucinski 1983) : ~ m. == m, (Hyades) - m,(obs). Dots give the observed indices , vectors give the interstellar reddening corrections (in many cases probably exaggerat ed) . S. M. 5 (b-y) Figure 5. The Sc, indices of W UMa systems: &cl~~ObS) (Hyades); cf. caption to Fig.

Publ. 2171, p. 333. J. 268, 800. A. J. 86, 1387. -C. J. 239, 919. E. , 1983. In "Activity in Red Dwarf Stars", IAU ColI. 71, Catania, Eds. B. Byrne, M. Rodo'lo, (Reidel), p. 481. J. 108, 15. Soc. 70, 111. H. , 1983. , 97, 225. P. J. 229,1143. , 1983, In "Activity in Red Dwarf Stars", IAU ColI. 71, Catania, eds. B. Byrne, M. Rodono, (Reidel), p. 83. C. , 1979, Astrophys,J. ) 233, L69. K. J. 252, 214. Soc. 11, 438. Stars, No. 1487. Egge, 48 S. M. Suppl. 33, 63. J. 260, 744. A. , 1983. Preprint. Pacific, 64, 200.

5. RESULTS OF LIGHT CURVE FITTING Lucy (1968b) first demonstrated that the light curves of close binary systems could be directly synthesized by computer using the Roche geometry. 08 for Paczynski's Star, AW UMa (Mochnacki & Doughty 1972a). Many workers have since then produced models for contact binaries, often using the code of Wilson & Devinney (1971). Compilations of models have been published by Rucinski (1974), Wilson (1978), Mochnacki (1981), Rahunen (1981), van HQmme (1982) and Whytc (1982).

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