Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-06-28
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures, accepted in A&A
Scientific paper
10.1051/0004-6361:20065719
We investigate the origin of the $\mathrm{Br}\gamma$ emission of the Herbig Ae star HD104237 on Astronomical Unit (AU) scales. Using AMBER/VLTI at a spectral resolution R=1500 spatially resolve the emission in both the BrGamma line and the adjacent continuum. The visibility does not vary between the continuum and the BrGamma line, even though the line is strongly detected in the spectrum, with a peak intensity 35% above the continuum. This demonstrates that the line and continuum emission have similar size scales. We assume that the K-band continuum excess originates in a ``puffed-up'' inner rim of the circumstellar disk, and discuss the likely origin of BrGamma. We conclude that this emission most likely arises from a compact disk wind, launched from a region 0.2-0.5 AU from the star, with a spatial extent similar to that of the near infrared continuum emission region, i.e, very close to the inner rim location.
consortium the AMBER
Isella Andrea
Marconi Alessandro
Natta Antonella
Tatulli Eric
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