The Mid-Infrared Emitting Dust Around AB Aur

Details The Mid-Infrared Emitting Dust Around AB Aur The Mid-Infrared Emitting Dust Around AB Aur

2003-03-04

arxiv.org/abs/astro-ph/0303064v1

Astrophys.J. 591 (2003) 267-274

Astronomy and Astrophysics

Astrophysics

ApJ in press, 4 color figures

Scientific paper

10.1086/375265

Using the Keck I telescope, we have obtained 11.7 micron and 18.7 micron images of the circumstellar dust emission from AB Aur, a Herbig Ae star. We find that AB Aur is probably resolved at 18.7 micron with an angular diameter of 1.2" at a surface brightness of 3.5 Jy/arcsec^2. Most of the dust mass detected at millimeter wavelengths does not contribute to the 18.7 micron emission, which is plausibly explained if the system possesses a relatively cold, massive disk. We find that models with an optically thick, geometrically thin disk, surrounded by an optically thin spherical envelope fit the data somewhat better than flared disk models.

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