Observational constraints for C-rich AGB stars

Gioia Rau (Korresp. Autor*in), Josef Hron, Claudia Paladini, Bernhard Aringer, Paola Marigo, Kjell Eriksson

Veröffentlichungen: Beitrag in FachzeitschriftMeeting Abstract/Conference PaperPeer Reviewed

Abstract

We modeled the atmospheres of six carbon-rich Asymptotic Giant Branch stars (R Lep, R Vol, Y Pav, AQ Sgr, U Hya, and X TrA) using VLTI/MIDI interferometric observations, together with spectro-photometric data, we compared them with self-consistent, dynamic model atmospheres. The results show that the models can reproduce the Spectral Energy Distribution (SED) data well at wavelengths longer than 1 mu m, and the interferometric observations between 8 mu m and 10 mu m. We found differences at wavelengths shorter than 1 mu m in the SED, and longer than 10 mu m in the visibilities. The discrepancies observed can be explained in terms of a combination of data- and model-related reasons. We derived some stellar parameters, and our findings agree well with literature values within the uncertainties. Also, when comparing the location of the stars in the H-R diagram, with evolutionary tracks, the results show that the main derived properties (L, Teff, C/O ratios and stellar masses) from the model fitting are in good agreement with TP-AGB evolutionary calculations.
OriginalspracheEnglisch
Seiten (von - bis)455-458
Seitenumfang4
FachzeitschriftMemorie Societa Astronomica Italiana
Jahrgang88
Ausgabenummer3
PublikationsstatusVeröffentlicht - Jan. 2017

ÖFOS 2012

  • 103003 Astronomie
  • 103004 Astrophysik

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