A new analytical thin-dusty-shell model to interpret interferometric data. Application to the S star π 1 Gruis

Details A new analytical thin-dusty-shell model to interpret interferometric data. Application to the S star π 1 Gruis A new analytical thin-dusty-shell model to interpret interferometric data. Application to the S star π 1 Gruis

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...452..885c&link_type=abstract

Astronomy and Astrophysics, Volume 452, Issue 3, June IV 2006, pp.885-895

Astronomy and Astrophysics

Astrophysics

2

Radiative Transfer, Methods: Analytical, Techniques: Interferometric, Circumstellar Matter, Stars: Late-Type, Infrared: Stars

Scientific paper

High angular resolution techniques allow the determination of physical and geometrical parameters characterizing the circumstellar dusty environment of late-type stars. The resolution of the radiative transfer equation under the thin-shell approximation provides an analytical expression for the interferometric visibility profile, which can then be compared to simple ad-hoc geometrical models and to physical models based on radiative transfer. Using the DUSTY numerical code to calculate theoretical visibilities of the S star π1 Gru, in agreement with spectrophotometric measurements from the near to the far infrared, we compared the validity of the output parameters found by the χ2 least-square analysis of the visibility, given with the thin-shell model and with a simple disk+ring geometrical model of the envelope. The results are discussed in terms of fitting the shape of the intensity profile and of the number of free parameters to be considered.

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