Modeling chromatic instrumental effects for a better model fitting of optical interferometric data

M. Tallon; I. Tallon-Bosc; O. Chesneau; L. Dessart

doi:10.1117/12.2057354

24 July 2014 Modeling chromatic instrumental effects for a better model fitting of optical interferometric data

M. Tallon, I. Tallon-Bosc, O. Chesneau, L. Dessart

Proceedings Volume 9146, Optical and Infrared Interferometry IV; 91460N (2014) https://doi.org/10.1117/12.2057354
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

Current interferometers often collect data simultaneously in many spectral channels by using dispersed fringes. Such polychromatic data provide powerful insights in various physical properties, where the observed objects show particular spectral features. Furthermore, one can measure spectral differential visibilities that do not directly depend on any calibration by a reference star. But such observations may be sensitive to instrumental artifacts that must be taken into account in order to fully exploit the polychromatic information of interferometric data. As a specimen, we consider here an observation of P Cygni with the VEGA visible combiner on CHARA interferometer. Indeed, although P Cygni is particularly well modeled by the radiative transfer code CMFGEN, we observe questionable discrepancies between expected and actual interferometric data. The problem is to determine their origin and disentangle possible instrumental effects from the astrophysical information. By using an expanded model fitting, which includes several instrumental features, we show that the differential visibilities are well explained by instrumental effects that could be otherwise attributed to the object. Although this approach leads to more reliable results, it assumes a fit specific to a particular instrument, and makes it more difficult to develop a generic model fitting independent of any instrument.

Citation Download Citation

M. Tallon, I. Tallon-Bosc, O. Chesneau, and L. Dessart "Modeling chromatic instrumental effects for a better model fitting of optical interferometric data", Proc. SPIE 9146, Optical and Infrared Interferometry IV, 91460N (24 July 2014); https://doi.org/10.1117/12.2057354

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
9 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Data modeling

Visibility

Instrument modeling

Stars

Interferometry

Atmospheric modeling

Sensors

Show All Keywords

Keywords/Phrases

Search In:

Publication Years