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Optical and Infrared Spectroscopy of CM Draconis

Published online by Cambridge University Press:  14 August 2015

S. Viti ,
H.R.A. Jones ,
F. Allard ,
A. Schweitzer  and
P. Hauschildt
S. Viti
Affiliation:
Department of Physics and Astronomy, University College London
H.R.A. Jones
Affiliation:
Institute of Astronomy, University of Tokyo Astrophysics, Liverpool JM University
F. Allard
Affiliation:
Department of Physics, Wichita State University
A. Schweitzer
Affiliation:
Landessternwarte Heidelberg
P. Hauschildt
Affiliation:
Department of Physics and Astronomy, The University of Georgia

Abstract

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We compare observations of the binary system CM Draconis with synthetic spectra. Spectroscopic observations from 0.40 to 2.41μm, combined with photometry and the accurately known surface gravity enable us to estimate the temperature and metallicity using detailed spectra synthesis. We find discrepancies between the analysis of the infrared and optical spectrum: while the optical spectral energy distribution (SED) yields a metal-rich solution with Teff = 3000K, the infrared SED yields around 3200K and —0.8 ≤ [M/H] ≤ —0.6 compatible with the high space motion of the system. The low-metallicity characteristics of the infrared SED could be real and is partly supported by the detailed analysis of the atomic lines in the optical region. Although, the known incompleteness of the TiO and H2O line lists in the models may cause substantial systematic errors.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 11 , Issue 1: Highlights of Astronomy. As presented at the XXIIIrd General Assembly of the IAU (Part A), 1997 , 1998 , pp. 441
Copyright
Copyright © Kluwer 1998