Abstract

The bright (mv ≈ 5) M3III star 4 Dra (HD108907, HR4765, CQ Dra) is a unique triple system combining in itself the basic structural properties of a symbiotic-like binary and of a cataclysmic one. The red giant 4 Dra A forms a wide binary (Porb ≈ 1703 d) with a hot companion 4 Dra B which seems to be a compact cataclysmic binary system (4 Dra BC, probable Porb of about 4 h).

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