Circumstellar Envelopes of OH/IR Stars

Details Circumstellar Envelopes of OH/IR Stars Circumstellar Envelopes of OH/IR Stars

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aspc..445..369r&link_type=abstract

Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants. Proceedings of a conference held at University Ca

Astronomy and Astrophysics

Astronomy

Scientific paper

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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