Issue |
A&A
Volume 658, February 2022
|
|
---|---|---|
Article Number | A81 | |
Number of page(s) | 25 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361/202141601 | |
Published online | 03 February 2022 |
VLTI-MATISSE L- and N-band aperture-synthesis imaging of the unclassified B[e] star FS Canis Majoris★
1
Max Planck Institute for Radio Astronomy,
Auf dem Hügel 69,
53121
Bonn,
Germany
e-mail: khh@mpifr-bonn.mpg.de
2
University of Kiel, Institute of Theoretical Physics and Astrophysics,
Leibnizstrasse 15,
24118
Kiel,
Germany
3
Laboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire,
CS 34229,
06304
Nice Cedex 4,
France
4
Institute for Mathematics, Astrophysics and Particle Physics, Radboud University,
PO Box 9010, MC 62,
6500
GL
Nijmegen,
The Netherlands
5
SRON Netherlands Institute for Space Research,
Sorbonnelaan 2,
3584
CA
Utrecht,
The Netherlands
6
School of Physics, Astrophysics Group, University of Exeter,
Stocker Road,
Exeter
EX4 4QL,
UK
7
Departamento de Ciencias Físicas, Facultad de Ciencias Exactas, Universidad Andrés Bello,
Fernández Concha 700,
Las Condes,
Santiago,
Chile
8
Leiden Observatory, Leiden University,
Niels Bohrweg 2,
2333
CA
Leiden,
The Netherlands
9
Max Planck Institute for Astronomy,
Königstuhl 17,
69117
Heidelberg,
Germany
10
European Southern Observatory,
Casilla
19001,
Santiago 19,
Chile
11
European Southern Observatory,
Karl Schwarzschild Strasse 2,
85748
Garching,
Germany
12
ASTRON,
Dwingeloo,
Netherlands
13
Anton Pannekoek Institute for Astronomy, University of Amsterdam,
Science Park 904,
1090
GE
Amsterdam,
The Netherlands
14
Univ. Grenoble Alpes, CNRS, IPAG,
38000,
Grenoble,
France
15
Department of Astrophysics, University of Vienna,
Türkenschanzstrasse 17,
1180
Vienna,
Austria
16
AIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot,
Sorbonne Paris Cité,
91191
Gif-sur-Yvette,
France
17
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences,
Konkoly Thege Miklósút 15-17,
1121
Budapest,
Hungary
18
Astrophysics Science Division, NASA/GSFC,
Greenbelt,
MD
20771,
USA
19
I. Physikalisches Institut, Universität zu Köln,
Zülpicher Str. 77,
50937,
Köln,
Germany
Received:
21
June
2021
Accepted:
14
November
2021
Context. FS Canis Majoris (FS CMa, HD 45677) is an unclassified B[e] star surrounded by an inclined dust disk. The evolutionary stage of FS CMa is still debated. Perpendicular to the circumstellar disk, a bipolar outflow was detected. Infrared aperture-synthesis imaging provides us with a unique opportunity to study the disk structure.
Aims. Our aim is to study the intensity distribution of the disk of FS CMa in the mid-infrared L and N bands.
Methods. We performed aperture-synthesis imaging of FS CMa with the MATISSE instrument (Multi AperTure mid-Infrared SpectroScopic Experiment) in the low spectral resolution mode to obtain images in the L and N bands. We computed radiative transfer models that reproduce the L- and N-band intensity distributions of the resolved disks.
Results. We present L- and N-band aperture-synthesis images of FS CMa reconstructed in the wavelength bands of 3.4–3.8 and 8.6–9.0 μm. In the L-band image, the inner rim region of an inclined circumstellar disk and the central object can be seen with a spatial resolution of 2.7 milliarcsec (mas). An inner disk cavity with an angular diameter of ~6 × 12 mas is resolved. The L-band disk consists of a bright northwestern (NW) disk region and a much fainter southeastern (SE) region. The images suggest that we are looking at the bright inner wall of the NW disk rim, which is on the far side of the disk. In the N band, only the bright NW disk region is seen. In addition to deriving the inclination and the inner disk radius, fitting the reconstructed brightness distributions via radiative transfer modelling allows one to constrain the innermost disk structure, in particular the shape of theinner disk rim.
Key words: techniques: interferometric / techniques: image processing / circumstellar matter / stars: emission-line, Be / stars: imaging / stars: individual: FS CMa
© K.-H. Hofmann et al. 2022
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Open Access funding provided by Max Planck Society.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.