Improved Constraints on the Disk around MWC 349A from the 23 m LBTI

S. Sallum, J. A. Eisner, P. M. Hinz, P. D. Sheehan, A. J. Skemer, P. G. Tuthill, J. S. Young

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Abstract

We present new spatially resolved observations of MWC 349A from the Large Binocular Telescope Interferometer (LBTI), a 23 m baseline interferometer made up of two, co-mounted 8 m telescopes. MWC 349A is a B[e] star with an unknown evolutionary state. Proposed scenarios range from a young stellar object, to a B[e] supergiant, to a tight binary system. Radio continuum and recombination line observations of this source revealed a sub-arcsecond bipolar outflow surrounding an ∼100 mas circumstellar disk. Follow-up infrared studies detected the disk, and suggested that it may have skew and an inner clearing. Our new infrared interferometric observations, which have more than twice the resolution of previously published data sets, support the presence of both skew and a compact infrared excess. They rule out inner clearings with radii greater than ∼14 mas. We show the improvements in disk parameter constraints provided by LBTI, and discuss the inferred disk parameters in the context of the posited evolutionary states for MWC 349A.

Original languageEnglish (US)
Article number22
JournalAstrophysical Journal
Volume844
Issue number1
DOIs
StatePublished - Jul 20 2017

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Keywords

  • circumstellar matter
  • stars: individual (MWC 349A)
  • techniques: interferometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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