Chiavassa, A., Kravchenko, K., Montarges, M., Millour, F., Matter, A., Freytag, B., Wittkowski, M., Hocde, V, Cruzalebes, P., Allouche, F., Lopez, B., Lagarde, S., Petrov, R. G., Meilland, A., Robbe-Dubois, S., Hofmann, K-H, Weigelt, G., Berio, P., Bendjoya, P., Bettonvil, F., de Souza, A. Domiciano, Heininger, M., Henning, Th, Isbell, J. W., Jaffe, W., Labadie, L., Lehmitz, M., Meisenheimer, K., Soulain, A., Varga, J., Augereau, J-C, van Boekel, R., Burtscher, L., Danchi, W. C., Dominik, C., Drevon, J., Rosas, V. Gamez, Hogerheijde, M. R., Hron, J., Klarmann, L., Kokoulina, E., Lagadec, E., Leftley, J., Mosoni, L., Nardetto, N., Paladini, C., Pantin, E., Schertl, D., Stee, P., Szabados, L., Waters, R., Wolf, S. and Yoffe, G. (2022). The extended atmosphere and circumstellar environment of the cool evolved star VX Sagittarii as seen by MATISSE star. Astron. Astrophys., 658. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

Full text not available from this repository.

Abstract

Context. VX Sgr is a cool, evolved, and luminous red star whose stellar parameters are difficult to determine, which affects its classification. Aims. We aim to spatially resolve the photospheric extent as well as the circumstellar environment. Methods. We used interferometric observations obtained with the MATISSE instrument in the L (3-4 mu m), M (4.5-5 mu m), and N (8-13 mu m) bands. We reconstructed monochromatic images using the MIRA software. We used 3D radiation-hydrodynamics simulations carried out with (COBOLD)-B-5 and a uniform disc model to estimate the apparent diameter and interpret the stellar surface structures. Moreover, we employed the radiative transfer codes OPTIM3D and RADMC3D to compute the spectral energy distribution for the L, M, and N bands, respectively. Results. MATISSE observations unveil, for the first time, the morphology of VX Sgr across the L, M, and N bands. The reconstructed images show a complex morphology with brighter areas whose characteristics depend on the wavelength probed. We measured the angular diameter as a function of the wavelength and showed that the photospheric extent in the L and M bands depends on the opacity through the atmosphere. In addition to this, we also concluded that the observed photospheric inhomogeneities can be interpreted as convection-related surface structures. The comparison in the N band yielded a qualitative agreement between the N-band spectrum and simple dust radiative transfer simulations. However, it is not possible to firmly conclude on the interpretation of the current data because of the difficulty in constraing the model parameters using the limited accuracy of our absolute flux calibration. Conclusions. MATISSE observations and the derived reconstructed images unveil the appearance of VX Sgr's stellar surface and circumstellar environment across a very large spectral domain for the first time.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Chiavassa, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kravchenko, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Montarges, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Millour, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Matter, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Freytag, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wittkowski, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hocde, VUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cruzalebes, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Allouche, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lopez, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lagarde, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Petrov, R. G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meilland, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Robbe-Dubois, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hofmann, K-HUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Weigelt, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Berio, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bendjoya, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bettonvil, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
de Souza, A. DomicianoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Heininger, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Henning, ThUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Isbell, J. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jaffe, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Labadie, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lehmitz, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meisenheimer, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Soulain, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Varga, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Augereau, J-CUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van Boekel, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Burtscher, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Danchi, W. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dominik, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Drevon, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rosas, V. GamezUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hogerheijde, M. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hron, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klarmann, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kokoulina, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lagadec, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Leftley, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mosoni, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nardetto, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Paladini, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pantin, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schertl, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stee, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Szabados, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Waters, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wolf, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yoffe, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-697594
DOI: 10.1051/0004-6361/202142514
Journal or Publication Title: Astron. Astrophys.
Volume: 658
Date: 2022
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
INTERSTELLAR SILICATE MINERALOGY; RED SUPERGIANTS; DUST SHELLS; SIO MASERS; MASS-LOSS; CONVECTION; MODELS; STEPS; VISIBILITIES; PULSATIONSMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/69759

Downloads

Downloads per month over past year

Altmetric

Export

Actions (login required)

View Item View Item