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Paper: The Molecular Layer of GCIRS7
Volume: 528, New Horizons in Galactic Center Astronomy and Beyond
Page: 397
Authors: Rodríguez-Coira, G.; Amorim, A.; Bauböck, M.; Benisty, M.; Berger, J.-P.; Clénet, Y.; Coudé Du Foresto, V.; de Zeeuw, T.; Dexter, J.; Duvert, G.; Eckart, A.; Eisenhauer, F.; Ferreira, M. C.; Gao, F.; Garcia, P. J. V.; Gendron, E.; Genzel, R.; Gillessen, S.; Gordo, P.; Habibi, M.; Horrobin, M.; Jimenez-Rosales, A.; Jocou, L.; Kervella, P.; Lacour, S.; Bouquin, J. L.; Léna, P.; Ott, T.; Pössel, M.; Paumard, T.; Perraut, K.; Perrin, G.; Pfuhl, O.; Rousset, G.; Straub, O.; Straubmeier, C.; Sturm, E.; Vincent, F.; von Fellenberg, S.; Waisberg, I.; Widmann, F.; GRAVITY Collaboration
Abstract: From all the stars formed inside the disk of young stars in the Galactic Centre, GCIRS7, a variable red supergiant in H and K bands, is by far the brightest of all of them. Using K band interferometric data (VLTI-GRAVITY), we measure uniform disk diameters around 20% times higher for wavelengths inside the CO absorption band compared to the continuum wavelengths, showing that a grey uniform disk model is not enough to reproduce the visibility curves of this star. A model based on a molecular spherical thin layer, already proven successful in other supergiant stars with similar spectral features, is implemented.
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