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We report high-resolution spectroscopic observations of the young star HD34700, which confirm it to be a double-lined spectroscopic binary. We derive anaccurate orbital solution with a period of 23.4877 +/- 0.0013 days and aneccentricity of e = 0.2501 +/- 0.0068. The stars are found to be of similarmass (M2/M1 = 0.987 +/- 0.014) and luminosity. We derive also the effectivetemperatures (5900 K and 5800 K) and projected rotational velocities (28 km/sand 22 km/s) of the components. These values of v sin i are much higher thanexpected for main-sequence stars of similar spectral type (G0), and are not dueto tidal synchronization. We discuss also the indicators of youth available forthe object. Although there is considerable evidence that the system is young--strong infrared excess, X-ray emission, Li I 6708 absorption (0.17 Angstromsequivalent width), H alpha emission (0.6 Angstroms), rapid rotation-- theprecise age cannot yet be established because the distance is unknown.Comment: 17 pages, including 2 figures and 2 tables. Accepted for publication  in AJ, to appear in February 200

A Double-lined Spectroscopic Orbit for the Young Star HD 34700