Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-12-14
Astrophys.J. 618 (2004) L133-L136
Astronomy and Astrophysics
Astrophysics
11 pages, 1 figure, Accepted for publication in ApJ Letters
Scientific paper
10.1086/427922
We present the results of adaptive optics nulling interferometric observations of two Herbig Ae stars, AB Aur and V892 Tau. Our observations at 10.3 microns show resolved circumstellar emission from both sources. Further analysis of the AB Aur emission suggests that there is an inclined disk surrounding the star. The diameter of the disk is derived to be 24 to 30 AU with an inclination of 45 to 65 degrees from face-on, and a major-axis PA of 30 +/- 15 degrees (E of N). Differences in the physical characteristics between the mid-IR emission and emission at other wavelengths (near-IR and millimeter), found in previous studies, suggest a complex structure for AB Aur's circumstellar environment, which may not be explained by a disk alone. The similarity in the observed size of AB Aur's resolved emission and that of another Herbig Ae star, HD 100546, is likely coincidental, as their respective evolutionary states and spectral energy distributions suggest significantly different circumstellar environments.
Brusa Guido
Hinz Philip M.
Hoffmann William F.
Kenworthy Matthew A.
Liu Wei-Min
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