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

• Verfasst von: Scholz, Michael [VerfasserIn]
• Verfasst von: Ireland, Michael J. [VerfasserIn]
• Verfasst von: Wood, Peter R. [VerfasserIn]
• Titel: Effects of moderate abundance changes on the atmospheric structure and colours of Mira variables
• Titelzusatz: research note
• Verf.angabe: M. Scholz, M.J. Ireland, and P.R. Wood
• E-Jahr: 2014
• Jahr: 21 May 2014
• Umfang: 4 S.
• Fussnoten: Gesehen am 26.08.2020
• Titel Quelle: Enthalten in: Astronomy and astrophysics
• Ort Quelle: Les Ulis : EDP Sciences, 1969
• Jahr Quelle: 2014
• Band/Heft Quelle: 565(2014) Artikel-Nummer A119, 4 Seiten
• ISSN Quelle: 1432-0746
• DOI: doi:10.1051/0004-6361/201323183
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1727839498

Abstract

<i>Aims. <i/>We study the effects of moderate deviations from solar abundances upon the atmospheric structure and colours of typical Mira variables.<i>Methods. <i/>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 <i>o<i/> Cet.<i>Results. <i/>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.