Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..511t&link_type=abstract
SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.
Astronomy and Astrophysics
Astrophysics
Scientific paper
We investigate the origin of the Brγ emission at the Astronomical Unit (AU) scale in the Herbig Ae star HD104237. Using AMBER/VLTI at a spectral resolution R = 1500 near the Brγ line, we resolve the emission spatially and spectrally. The differential visibility does not show variations between the continuum and the Brγ line, although the line is clearly detected in the uncorrelated spectrum with a peak intensity 35% higher than the continuum. We assume that the continuum excess emission in the K-band is produced in a ``puffed-up'' inner rim of the circumstellar disk and discuss the implications of our result on the origin of Brγ. We conclude that the emission most likely arises from a compact disk wind, launched from a region 0.2-0.5 AU from the star, with a spatial extension similar to that of the near infrared continuum emission region, i.e, very close to the inner rim location.
Amber Consortium
Isella Andrea
Marconi Alessandro
Natta Antonella
Tatulli Eric
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