Radio Photosphere and Mass-Loss Envelope of VY CMa

Details Radio Photosphere and Mass-Loss Envelope of VY CMa Radio Photosphere and Mass-Loss Envelope of VY CMa

2005-02-28

arxiv.org/abs/astro-ph/0502586v1

Astrophys.J. 626 (2005) 439-445

Astronomy and Astrophysics

Astrophysics

Accepted for publication in June 10, 2005, ApJ. 20 pages, 5 figures

Scientific paper

10.1086/429900

We have used the VLA to detect emission from the supergiant VY CMa at radio wavelengths and have constructed 3000-4500 K isothermal outer atmospheres constrained by the data. These models produce a radio photosphere at 1.5-2 R_ast. An extrapolation of the model can account for the observed total mass-loss rate of the star. We also present mid-infrared imaging of the supergiant that suggests warm dust is extended in the same direction as the near-infrared reflection nebula around VY CMa. The origin of the asymmetries in the outflow remains an unsolved problem.

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