Improving the diameters of interferometric calibrators with MATISSE

Autor(en)

Sylvie Robbe-Dubois, Pierre Cruzalèbes, Ph. Berio, A. Meilland, R.-G. Petrov, F. Allouche, D. Salabert, C. Paladini, Alexis Matter, F. Millour, S. Lagarde, B. Lopez, L. Burtscher, W. Jaffe, J. Hron, I. Percheron, Roy von Boekel, G. Weigelt, Ph. Stee

Abstrakt

A good knowledge of the angular diameters of stars used to calibrate the

observables in stellar interferometry is fundamental. As the available

precision for giant stars is worse than the required per cent level, we

aim to improve the knowledge of many diameters using MATISSE (Multiple

AperTure mid-Infrared SpectroScopic Experiment) data in its different

instrumental configurations. Using the squared visibility MATISSE

observable, we compute the angular diameter value, which ensures the

best-fitting curves, assuming an intensity distribution of a uniform

disc. We take into account that the transfer function varies over the

wavelength and is different from one instrumental configuration to

another. The uncertainties on the diameters are estimated using the

residual bootstrap method. Using the low spectral resolution mode in the

L band, we observed a set of 35 potential calibrators selected in the

Mid-infrared stellar Diameter and Flux Compilation Catalogue with

diameters ranging from about 1 to 3 mas. We reach a precision on the

diameter estimates in the range 0.6 per cent to 4.1 per cent. The study

of the stability of the transfer function in visibility over two nights

makes us confident in our results. In addition, we identify one star, 75

Vir initially present in the calibrator lists, for which our method does

not converge, and prove to be a binary star. This leads us to the

conclusion that our method is actually necessary to improve the quality

of the astrophysical results obtained with MATISSE, and that it can be

used as a useful tool for 'bad calibrator' detection.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Université Côte d'Azur, Leiden University, European Southern Observatory (Germany), Max-Planck-Institut für Radioastronomie, Max-Planck-Institut für Astronomie, European Organisation for Astronomical Research in the Southern Hemisphere (ESO)

Journal

Monthly Notices of the Royal Astronomical Society

Band

510

Seiten

82-94

Anzahl der Seiten

13

ISSN

0035-8711

DOI

https://doi.org/10.1093/mnras/stab3284

Publikationsdatum

02-2022

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Schlagwörter

ASJC Scopus Sachgebiete

Astronomy and Astrophysics, Space and Planetary Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/b62fce61-8882-4f18-abc6-88210ca8ee9f