AN ANALYSIS OF THE AP SPECTROSCOPIC BINARY HD-59435

HD 59435 is a double-lined spectroscopic binary (SB2), with slowly rot ating components of very similar luminosity. It was studied through hi gh-resolution spectroscopy, photometry and CORAVEL observations.(1) Or bital elements are presented. The orbital period is 1387 days. The lin e of sight lies close to the orbital plane, but no eclipses have been observed so far. The primary is an evolved G8 or K0 star, which has li kely just descended the Red Giant Branch. The secondary is a cool Ap s tar close to the end of its main-sequence life. It shows lines resolve d into magnetically split components, from which its mean magnetic fie ld modulus can be diagnosed. The field varies with a remarkably large relative amplitude, over a rotation period which is at least of the or der of 3 years.