EAS Publications Series
Volume 59, 2013New Concepts in Imaging: Optical and Statistical Models
|Page(s)||141 - 154|
|Section||Physical Bases and New Challenges in High Resolution Imaging|
|Published online||13 March 2013|
D. Mary, C. Theys and C. Aime (eds)
EAS Publications Series, 59 (2013) 141-154
High Angular Resolution and Young Stellar Objects: Imaging the Surroundings of MWC 158 by Optical Interferometry
Institut de Planétologie et d’Astrophysique de
Grenoble, UMR 5274,
BP. 53, 38041
Grenoble Cedex 9,
2 ESO, Santiago Office, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago de Chile, Chile
In the course of our VLTI young stellar object PIONIER imaging program, we have identified a strong visibility chromatic dependency that appeared in certain sources. This effect, rising value of visibilities with decreasing wavelengths over one base, is also present in previous published and archival AMBER data. For Herbig AeBe stars, the H band is generally located at the transition between the star and the disk predominance in flux for Herbig AeBe stars. We believe that this phenomenon is responsible for the visibility rise effect. We present a method to correct the visibilities from this effect in order to allow “gray” image reconstruction software, like Mira, to be used. In parallel we probe the interest of carrying an image reconstruction in each spectral channel and then combine them to obtain the final broadband one. As an illustration we apply these imaging methods to MWC158, a (possibly Herbig) B[e] star intensively observed with PIONIER. Finally, we compare our result with a parametric model fitted onto the data.
© EAS, EDP Sciences 2013
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