Intricate visibility effects from resolved emission of young stellar objects: the case of MWC158 observed with the VLTI

J. Kluska; F. Malbet; J.-P. Berger; B. Lazareff; J.-B. Le Bouquin; M. Benisty; F. Menard; C. Pinte; R. Millan-Gabet; W. Traub

doi:10.1117/12.925456

12 September 2012 Intrincate visibility effects from resolved emission of young stellar objects: the case of MWC158 observed with the VLTI

J. Kluska, F. Malbet, J.-P. Berger, B. Lazareff, J.-B. Le Bouquin, M. Benisty, F. Menard, C. Pinte, R. Millan-Gabet, W. Traub

Author Affiliations +

Proceedings Volume 8445, Optical and Infrared Interferometry III; 84450O (2012) https://doi.org/10.1117/12.925456
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

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.

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J. Kluska, F. Malbet, J.-P. Berger, B. Lazareff, J.-B. Le Bouquin, M. Benisty, F. Menard, C. Pinte, R. Millan-Gabet, and W. Traub "Intrincate visibility effects from resolved emission of young stellar objects: the case of MWC158 observed with the VLTI", Proc. SPIE 8445, Optical and Infrared Interferometry III, 84450O (12 September 2012); https://doi.org/10.1117/12.925456

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KEYWORDS

Stars

Visibility

Colorimetry

Image restoration

Interferometry

Black bodies

Telescopes

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