Effects of moderate abundance changes on the atmospheric structure and colours of Mira variables

M. Scholz, M. J. Ireland, P. R. Wood

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Abstract

Aims. We study the effects of moderate deviations from solar abundances upon the atmospheric structure and colours of typical Mira variables. Methods. We present two model series of dynamical opacity-sampling models of Mira variables which have (1) 1/3 solar metallicity; and (2) "mild" S-type C/O abundance ratio ([C/O] = 0.9) with typical Zr enhancement (solar +1.0). These series are compared to a previously studied solar-abundance series which has similar fundamental parameters (mass, luminosity, period, radius) that are close to those of o Cet. Results. Both series show noticeable effects of abundance upon stratifications and infrared colours but cycle-to-cycle differences mask these effects at most pulsation phases, with the exception of a narrow-water-filter colour near minimum phase.

Original languageEnglish
Article numberA119
Pages (from-to)1-4
Number of pages4
JournalAstronomy and Astrophysics
Volume565
DOIs
Publication statusPublished - May 2014

Bibliographical note

Copyright ESO 2014. First published in Astronomy and astrophysics 565, A119, 2014, published by EDP Sciences. The original publication is available at http://doi.org/10.1051/0004-6361/201323183

Keywords

  • stars: AGB and post-AGB
  • stars: atmospheres
  • stars: abundances

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