Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iaus..256..454o&link_type=abstract
The Magellanic System: Stars, Gas, and Galaxies, Proceedings of the International Astronomical Union, IAU Symposium, Volume 256,
Astronomy and Astrophysics
Astronomy
Techniques: Interferometric, Infrared: Stars, Circumstellar Matter, Stars: Evolution, Stars: Late-Type, Stars: Mass Loss, Supergiants, Magellanic Clouds
Scientific paper
We present mid-IR long-baseline interferometric observations of the red supergiant WOH G64 in the Large Magellanic Cloud with MIDI at the ESO's Very Large Telescope Interferometer (VLTI). Our MIDI observations of WOH G64 are the first VLTI observations to spatially resolve an individual stellar source in an extragalactic system. Our 2-D radiative transfer modeling reveals the presence of a geometrically and optically thick torus seen nearly pole-on. This model brings WOH G64 in much better agreement with the current evolutionary tracks for a 25 M&sun; star — about a half of the previous estimate of 40 M&sun; — and solves the serious discrepancy between theory and observation which existed for this object.
Driebe Thomas
Hofmann Karl-Heinz
Ohnaka Keiichi
Weigelt Gerd
Wittkowski Markus
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