The Metallicity of the HD 98800 System

Abstract

Pre-main sequence (PMS) binaries and multiples enable critical tests of stellar models if masses, metallicities, and luminosities of the component stars are known. We have analyzed high-resolution, high signal-to-noise echelle spectra of the quadruple-star system HD 98800 and using spectrum synthesis, computed fits to the composite spectrum for a full range of plausible stellar parameters for the components. We consistently find that sub-solar metallicity yields fits with lower ${\chi }^2$ values, with an overall best-fit of $[M/H]=-0.20\pm 0.10$. This metallicity appears to be consistent with PMS evolutionary tracks for the measured masses and luminosities of the components of HD 98800 but additional constraints on the system and modelling are needed.

6 pages, 3 figures, 5 tables. Online-only material: color figure. Accepted in ApJ

References in corpus (1)

• Validation of the new Hipparcos reduction

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• Testing pre-main sequence models: the power of a Bayesian approach
• New Parallaxes and a Convergence Analysis for the TW Hya Association
• The HD 98800 quadruple pre-main sequence system. Towards full orbital characterisation using long-baseline infrared interferometry