A red supergiant nebula at 25 micron: arcsecond scale mass-loss asymmetries of mu Cep

Details A red supergiant nebula at 25 micron: arcsecond scale mass-loss asymmetries of mu Cep A red supergiant nebula at 25 micron: arcsecond scale mass-loss asymmetries of mu Cep

2008-08-09

arxiv.org/abs/0808.1341v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ Letters

Scientific paper

10.1086/592384

We present diffraction limited (0.6") 24.5micron Subaru/COMICS images of the red supergiant mu Cep. We report the detection of a circumstellar nebula, that was not detected at shorter wavelengths. It extends to a radius of at least 6" in the thermal infrared. On these angular scales, the nebula is roughly spherical, in contrast, it displays a pronounced asymmetric morphology closer in. We simultaneously model the azimuthally averaged intensity profile of the nebula and the observed spectral energy distribution using spherical dust radiative transfer models. The models indicate a constant mass-loss process over the past 1000 years, for mass-loss rates a few times 10^(-7) Msun/yr. This work supports the idea that at least part of the asymmetries in shells of evolved massive stars and supernovae may be due to the mass-loss process in the red supergiant phase.

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