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Dynamical opacity-sampling models of Mira variables – I. Modelling description and analysis of approximations

Ireland, M. J. and Scholz, M. and Wood, P. R. (2008) Dynamical opacity-sampling models of Mira variables – I. Modelling description and analysis of approximations. Monthly Notices of the Royal Astronomical Society, 391 (4). pp. 1994-2002. ISSN 0035-8711.

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We describe the Cool Opacity-sampling Dynamic EXtended (codex) atmosphere models of Mira variable stars, and examine in detail the physical and numerical approximations that go in-to the model creation. The codex atmospheric models are obtained by computing the temperature and the chemical and radiative states of the atmospheric layers, assuming gas pressure and velocity profiles from Mira pulsation models, which extend from near the H-burning shell to the outer layers of the atmosphere. Although the code uses the approximation of Local Thermodynamic Equilibrium (LTE) and a grey approximation in the dynamical atmosphere code, many key observable quantities, such as infrared diameters and low-resolution spectra, are predicted robustly in spite of these approximations. We show that in visible light, radiation from Mira variables is dominated by fluorescence scattering processes, and that the LTE approximation likely underpredicts visible-band fluxes by a factor of 2.

Item Type:Article
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URLURL TypeDescription
Ireland, M. J.0000-0002-6194-043X
Additional Information:© 2008 The Authors. Journal compilation © 2008 RAS. Accepted 2008 October 2. Received 2008 October 2; in original form 2008 August 9. Published Online: 27 November 2008. MJI would like to acknowledge Michelson Fellowship support from the Michelson Science Center and the NASA Navigator Program. MS would like to acknowledge support from the Deutsche Forschungsgemeinschaft with the grant 'Time Dependence of Mira Atmospheres'.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Michaelson Science CenterUNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Subject Keywords:stars: AGB and post-AGB; stars: variables: other
Issue or Number:4
Record Number:CaltechAUTHORS:IREmnras08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12917
Deposited By: Archive Administrator
Deposited On:12 Jan 2009 17:41
Last Modified:13 Dec 2019 04:12

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