Hostname: page-component-76fb5796d-5g6vh Total loading time: 0 Render date: 2024-04-25T11:49:04.531Z Has data issue: false hasContentIssue false
  • English
  • Français

The Structure of the Inner Circumstellar Shell in Miras

Published online by Cambridge University Press:  30 December 2019

Kenneth H. Hinkle Open the ORCID record for Kenneth H. Hinkle [Opens in a new window]  and
Thomas Lebzelter Open the ORCID record for Thomas Lebzelter [Opens in a new window]
Kenneth H. Hinkle
Affiliation:
National Optical Astronomy Observatory, P.O. Box 26732, Tucson, Az, USA email: hinkle@noao.edu
Thomas Lebzelter
Affiliation:
Dept. of Astrophysics, Univ. of Vienna, Vienna, Austria email: thomas.lebzelter@univie.ac.at
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We have measured CO line profiles in a time series of 42 high-resolution 1.6 − 2.5 μm spectra of R Cas. The low-excitation CO first overtone lines have a contribution from a ∼1000 K region. We show that this region undergoes a periodic changes on time scales many times longer than the photospheric pulsation. Comparison with interferometry and models suggests that the ∼1000 K region is at ∼2 R* and cospatial with the region of SiO masers and grain condensation. The CO lines are entirely in absorption requiring formation in a layer thin compared to the stellar diameter. The CO excitation temperature has been measured as low as 600 K suggesting that grains with a variety of compositions condense at ∼2 R*.

Keywords

stars: AGB and post-AGB(stars:) circumstellar matterstars: variables: other
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 419 - 420
Copyright
© International Astronomical Union 2019 

References

Assaf, K.A., Diamond, P.J., Richards, A.M.S., et al. 2011 MNRAS 415 1083 CrossRefGoogle Scholar
Bladh, S., Höfner, S., Aringer, B., et al. 2015 A&A 557 A105 CrossRefGoogle Scholar
Gail, H.-P., Scholz, M., & Pucci, A. 2016 A&A 591 A17 CrossRefGoogle Scholar
Hinkle, K.H. 1978, ApJ, 220, 210 CrossRefGoogle Scholar
Hinkle, K.H. & Barnes, T.G. 1979, ApJ, 227, 923 CrossRefGoogle Scholar
Hinkle, K.H., Hall, D.N.B., & Ridgway, S.T. 1982, ApJ, 252, 697 10.1086/159596CrossRefGoogle Scholar
Hinkle, K.H., Scharlach, W.W.G., & Hall, D.N.B. 1984, ApJS, 56, 1 CrossRefGoogle Scholar
Ireland, M.J., Scholz, M., & Wood, P.R. 2011 MNRAS 418 114 CrossRefGoogle Scholar
Liljegren, S., Höfner, S., Eriksson, K., et al. 2017 A&A 606 A6 CrossRefGoogle Scholar
Ohnaka, K., Weigelt, G., Hofmann, K.-H. 2017 A&A 597 A20 10.1051/0004-6361/201629761CrossRefGoogle Scholar
Woitke, P. 2006 A&A 460, L9 CrossRefGoogle Scholar
Wong, K.T., Kamiński, T., Menten, K.M., et al. 2016 A&A 590 A127 CrossRefGoogle Scholar