A double-lined spectroscopic orbit for the young star HD 34700

Abstract

We report high-resolution spectroscopic observations of the young star HD 34700, which confirm it to be a double-lined spectroscopic binary. We derive an accurate orbital solution with a period of 23.4877 +/- 0.0013 days and an eccentricity of e = 0.2501 +/- 0.0068. The stars are found to be of similar mass (M2/M1 = 0.987 +/- 0.014) and luminosity. We derive also the effective temperatures (5900 K and 5800 K) and projected rotational velocities (28 km/s and 22 km/s) of the components. These values of v sin i are much higher than expected for main-sequence stars of similar spectral type (G0), and are not due to tidal synchronization. We discuss also the indicators of youth available for the object. Although there is considerable evidence that the system is young --strong infrared excess, X-ray emission, Li I 6708 absorption (0.17 Angstroms equivalent width), H alpha emission (0.6 Angstroms), rapid rotation-- the precise age cannot yet be established because the distance is unknown.

17 pages, including 2 figures and 2 tables. Accepted for publication in AJ, to appear in February 2004

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• A Simple Time-Dependent Method for Calculating Spirals: Applications to Eccentric Planets in Protoplanetary discs
• Mid-IR observations of circumstellar disks -- Part III: A mixed sample of PMS stars and Vega-type objects
• Dust and Polycyclic Aromatic Hydrocarbon in the HD 34700 Debris Disk
• TIC 278956474: Two close binaries in one young quadruple system, identified by \textit{TESS}
• Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): HD 34700 A unveils an inner ring
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• Astrometric view of companions in the inner dust cavities of protoplanetary disks
• The Circumbinary Disk of HD 34700A: I. CO gas kinematics indicate spirals, infall, and vortex motions
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• The Circumbinary Disc of HD 34700A II. Analysis of a strong dust asymmetry