Skip to main content Accessibility help
×
Home
Hostname: page-component-65dc7cd545-sqtsj Total loading time: 0.196 Render date: 2021-07-25T02:37:25.554Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "metricsAbstractViews": false, "figures": true, "newCiteModal": false, "newCitedByModal": true, "newEcommerce": true, "newUsageEvents": true }

The Structure of the Inner Circumstellar Shell in Miras

Published online by Cambridge University Press:  30 December 2019

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
Corresponding
Rights & Permissions[Opens in a new window]

Abstract

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*.

Type
Contributed Papers
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
You have Access

Send article to Kindle

To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

The Structure of the Inner Circumstellar Shell in Miras
Available formats
×

Send article to Dropbox

To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

The Structure of the Inner Circumstellar Shell in Miras
Available formats
×

Send article to Google Drive

To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

The Structure of the Inner Circumstellar Shell in Miras
Available formats
×
×

Reply to: Submit a response

Please enter your response.

Your details

Please enter a valid email address.

Conflicting interests

Do you have any conflicting interests? *