EDP Sciences
Free access
Volume 441, Number 2, October II 2005
Page(s) 563 - 571
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20042252

A&A 441, 563-571 (2005)
DOI: 10.1051/0004-6361:20042252

Flaring and self-shadowed disks around Herbig Ae stars: simulations for 10 $\mu$m interferometers

R. van Boekel1, 2, C. P. Dullemond3 and C. Dominik1

1  Sterrenkundig Instituut "Anton Pannekoek", Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
    e-mail: vboekel@science.uva.nl
2  European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching, Germany
3  Max-Planck-Institut für Astronomie Heidelberg, Königstuhl 17, Heidelberg, Germany

(Received 26 October 2004 / Accepted 27 June 2005)

We present simulations of the interferometric visibilities of Herbig Ae star disks. We investigate whether interferometric measurements in the 10 $\mu$m atmospheric window are sensitive to the presence of an increased scale height at the inner disk edge, predicted by recent models. Furthermore, we investigate whether such measurements can discriminate between disks with a "flaring" geometry and disks with a "flat" geometry. We show that both these questions can be addressed, using measurements at a small number of appropriately chosen baselines. The classification of Herbig Ae stars in two groups, based on the appearance of the spectral energy distribution (SED), has been attributed to a difference in disk geometry. Sources with a group I SED would have a flaring outer disk geometry, whereas the disk of group II sources is proposed to be flat (or "self-shadowed"). We show that this hypothesis can be tested using long-baseline interferometric measurements in the 10 $\mu$m atmospheric window.

Key words: stars: circumstellar matter -- stars: pre-main-sequence -- techniques: interferometric -- radiative transfer

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© ESO 2005