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

Guillermo Torres | Zendy

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

Author(s) -

Guillermo Torres

Publication year - 2004

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/381066

Subject(s) - astrophysics , physics , stars , luminosity , orbital period , orbital eccentricity , eccentricity (behavior) , angstrom , star (game theory) , be star , infrared , binary number , orbit (dynamics) , emission spectrum , spectral line , astronomy , chemistry , crystallography , engineering , aerospace engineering , arithmetic , mathematics , galaxy , political science , law

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

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