VLTI/MIDI observations of the circumstellar shell of an AGB star: W Hydrae

R. de Grijs, M. Marengo, G. Pietrzynski

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review


W Hydrae is a prototype AGB star with a dusty circumstellar shell. The shell is marginally resolved at ground-based subarcsecond resolution; the unresolved dust condensation radius is expected to be of order 30-50 mas. Since the dusty circumstellar shell is brightest in the mid-IR, the high spatial resolution required at midinfrared wavelengths can currently only be achieved by using MIDI on the VLTI. We therefore outline a possible observing programme for the VLTI, using MIDI at 10 pm. In a single night of short-baseline VLTI observations with two Auxiliary Telescopes, we can achieve sufficient (u,v) plane coverage to resolve the shell geometry of W Hya, which will provide strong constraints on the mass loss processes in late-type stars. We expect to either obtain an estimate of the dust condensation temperature, or evidence for interrupted mass loss.

Original languageEnglish
Title of host publicationObserving with the VLT interferometer
Subtitle of host publicationproceedings of the 2002 EuroWinter School : Les Houches, France, February 3-8, 2002
EditorsG Perrin, F Malbet
PublisherEDP Sciences
Number of pages1
ISBN (Print)2868836526, 9782868836526
Publication statusPublished - 2003
Externally publishedYes
EventEuroWinter School on Observing with the VLT Interferometer - Les Houches, France
Duration: 3 Feb 20028 Feb 2002

Publication series

NameEAS publications series
PublisherEDP Sciences
ISSN (Print)1633-4760


ConferenceEuroWinter School on Observing with the VLT Interferometer
CityLes Houches


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