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

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

doi:10.1051/0004-6361/201323183

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 language	English
Article number	A119
Pages (from-to)	1-4
Number of pages	4
Journal	Astronomy and Astrophysics
Volume	565
DOIs	https://doi.org/10.1051/0004-6361/201323183
Publication status	Published - 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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10.1051/0004-6361/201323183

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Cite this

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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.",

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author = "M. Scholz and Ireland, {M. J.} and Wood, {P. R.}",

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AU - Scholz, M.

AU - Ireland, M. J.

AU - Wood, P. R.

N1 - 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

PY - 2014/5

Y1 - 2014/5

N2 - 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.

AB - 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.

KW - stars: AGB and post-AGB

KW - stars: atmospheres

KW - stars: abundances

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DO - 10.1051/0004-6361/201323183

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EP - 4

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A119

ER -

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

Abstract

Bibliographical note

Keywords

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