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- Ruiz-Velasco, A. E. (author)
Circumstellar Envelopes of OH/IR Stars
- Article/chapterEnglish2011
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- 2011
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- LIBRIS-ID:oai:DiVA.org:uu-170176
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-170176URI
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- Language:English
- Summary in:English
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- We present VLTI observations of the tip-AGB star IRAS 17020-5254 carried out with the AMBER and MIDI instruments using the 1.8-m Auxiliary Telescopes (ATs) with three different baselines. This star is an evolved oxygen-rich single star of the OH/IR type. We fit the resulting near-infrared visibilities with a model consisting of a Gaussian component plus a central uniform disk, obtaining apparent diameters of the dust shell, the central star, and their flux ratios. We also show the uniform disk diameter as a function of wavelength from both the AMBER and MIDI observations. The mid-infrared diameter is about two to three times larger than the near-infrared one. We plan to compare these data to hydrodynamic atmosphere and wind models.
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- Wittkowski, M. (author)
- Driebe, T. (author)
- Wachter, A. (author)
- Höfner, SusanneUppsala universitet,Teoretisk astrofysik(Swepub:uu)sho27173 (author)
- Uppsala universitetTeoretisk astrofysik (creator_code:org_t)
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- In:Why Galaxies Care about AGB Stars II
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