Constraining the wind launching region in Herbig Ae stars: AMBER/VLTI spectroscopy of HD 104237

E Tatulli, A Isella, A Natta, L Testi, A Marconi… - Astronomy & …, 2007 - aanda.org
E Tatulli, A Isella, A Natta, L Testi, A Marconi, F Malbet, P Stee, RG Petrov, F Millour, A Chelli…
Astronomy & Astrophysics, 2007aanda.org
Aims. We investigate the origin of the emission of the Herbig Ae star HD 104237 on
Astronomical Unit (AU) scales. Methods. Using AMBER/VLTI at a spectral resolution we
spatially resolve the emission in both the line and the adjacent continuum. Results. The
visibility does not vary between the continuum and the 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 …
Aims
We investigate the origin of the  emission of the Herbig Ae star HD 104237 on Astronomical Unit (AU) scales.
Methods
Using AMBER/VLTI at a spectral resolution we spatially resolve the emission in both the  line and the adjacent continuum.
Results
The visibility does not vary between the continuum and the  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 .
Conclusions
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.
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