MOLsphere and pulsations of the Galactic ...
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Title :
MOLsphere and pulsations of the Galactic Center’s red supergiant GCIRS 7 from VLTI/GRAVITY
Author(s) :
Rodríguez-Coira, G. [Auteur correspondant]
Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
Paumard, T. [Auteur]
Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
Perrin, G. [Auteur]
Vincent, F. [Auteur]
Récepteurs nucléaires, maladies cardiovasculaires et diabète - U 1011 [RNMCD]
Abuter, R. [Auteur]
Amorim, A. [Auteur]
Bauböck, M. [Auteur]
Berger, J. P. [Auteur]
BONNET, H. [Auteur]
Département de Chimie Moléculaire - Ingéniérie et Intéractions BioMoléculaires [DCM - I2BM]
Brandner, W. [Auteur]
Clénet, Y. [Auteur]
Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
De Zeeuw, P. T. [Auteur]
Dexter, J. [Auteur]
Drescher, A. [Auteur]
Eckart, A. [Auteur]
Eisenhauer, F. [Auteur]
Förster Schreiber, N. M. [Auteur]
Max-Planck-Institut für Extraterrestrische Physik [MPE]
Gao, F. [Auteur]
Garcia, P. [Auteur]
Gendron, E. [Auteur]
Laboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA]
Genzel, R. [Auteur]
Gillessen, S. [Auteur]
Habibi, M. [Auteur]
Wageningen University and Research [Wageningen] [WUR]
Haubois, X. [Auteur]
European Southern Observatory [Santiago] [ESO]
Henning, T. [Auteur]
Hippler, S. [Auteur]
Horrobin, M. [Auteur]
Jimenez-rosales, A. [Auteur]
Jochum, L. [Auteur]
European Southern Observatory [ESO]
Jocou, L. [Auteur]
Kaufer, A. [Auteur]
Kervella, P. [Auteur]
Lacour, S. [Auteur]
Institut Européen des membranes [IEM]
Lapeyrère, V. [Auteur]
Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
Le Bouquin, J. B. [Auteur]
Institut de Planétologie et d'Astrophysique de Grenoble [IPAG]
Léna, P. [Auteur]
Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
Nowak, M. [Auteur]
Ott, T. [Auteur]
Perraut, K. [Auteur]
Institut de Planétologie et d'Astrophysique de Grenoble [IPAG]
Pfuhl, O. [Auteur]
Sanchez-Bermudez, J. [Auteur]
Max Planck Institute for Astronomy [MPIA]
Shangguan, J. [Auteur]
Scheithauer, S. [Auteur]
Stadler, J. [Auteur]
Straub, O. [Auteur]
Straubmeier, C. [Auteur]
Sturm, E. [Auteur]
Tacconi, L. J. [Auteur]
Max-Planck-Institut für Extraterrestrische Physik [MPE]
Shimizu, T. [Auteur]
Von fellenberg, S. [Auteur]
Waisberg, I. [Auteur]
Widmann, F. [Auteur]
Wieprecht, E. [Auteur]
Wiezorrek, E. [Auteur]
Woillez, J. [Auteur]
Yazici, S. [Auteur]
Zins, G. [Auteur]
Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
Paumard, T. [Auteur]
Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
Perrin, G. [Auteur]
Vincent, F. [Auteur]
Récepteurs nucléaires, maladies cardiovasculaires et diabète - U 1011 [RNMCD]
Abuter, R. [Auteur]
Amorim, A. [Auteur]
Bauböck, M. [Auteur]
Berger, J. P. [Auteur]
BONNET, H. [Auteur]
Département de Chimie Moléculaire - Ingéniérie et Intéractions BioMoléculaires [DCM - I2BM]
Brandner, W. [Auteur]
Clénet, Y. [Auteur]
Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
De Zeeuw, P. T. [Auteur]
Dexter, J. [Auteur]
Drescher, A. [Auteur]
Eckart, A. [Auteur]
Eisenhauer, F. [Auteur]
Förster Schreiber, N. M. [Auteur]
Max-Planck-Institut für Extraterrestrische Physik [MPE]
Gao, F. [Auteur]
Garcia, P. [Auteur]
Gendron, E. [Auteur]
Laboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA]
Genzel, R. [Auteur]
Gillessen, S. [Auteur]
Habibi, M. [Auteur]
Wageningen University and Research [Wageningen] [WUR]
Haubois, X. [Auteur]
European Southern Observatory [Santiago] [ESO]
Henning, T. [Auteur]
Hippler, S. [Auteur]
Horrobin, M. [Auteur]
Jimenez-rosales, A. [Auteur]
Jochum, L. [Auteur]
European Southern Observatory [ESO]
Jocou, L. [Auteur]
Kaufer, A. [Auteur]
Kervella, P. [Auteur]
Lacour, S. [Auteur]
Institut Européen des membranes [IEM]
Lapeyrère, V. [Auteur]
Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
Le Bouquin, J. B. [Auteur]
Institut de Planétologie et d'Astrophysique de Grenoble [IPAG]
Léna, P. [Auteur]
Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
Nowak, M. [Auteur]
Ott, T. [Auteur]
Perraut, K. [Auteur]
Institut de Planétologie et d'Astrophysique de Grenoble [IPAG]
Pfuhl, O. [Auteur]
Sanchez-Bermudez, J. [Auteur]
Max Planck Institute for Astronomy [MPIA]
Shangguan, J. [Auteur]
Scheithauer, S. [Auteur]
Stadler, J. [Auteur]
Straub, O. [Auteur]
Straubmeier, C. [Auteur]
Sturm, E. [Auteur]
Tacconi, L. J. [Auteur]
Max-Planck-Institut für Extraterrestrische Physik [MPE]
Shimizu, T. [Auteur]
Von fellenberg, S. [Auteur]
Waisberg, I. [Auteur]
Widmann, F. [Auteur]
Wieprecht, E. [Auteur]
Wiezorrek, E. [Auteur]
Woillez, J. [Auteur]
Yazici, S. [Auteur]
Zins, G. [Auteur]
Publisher :
EDP Sciences
Publication date :
2021
English keyword(s) :
Galaxy: nucleus
techniques: interferometric
stars: individual: GCIRS 7
stars: fundamental parameters
supergiants
techniques: interferometric
stars: individual: GCIRS 7
stars: fundamental parameters
supergiants
HAL domain(s) :
Physique [physics]/Astrophysique [astro-ph]
English abstract : [en]
Context. GCIRS 7, the brightest star in the Galactic central parsec, formed 6 ± 2 Myr ago together with dozens of massive stars in a disk orbiting the central black-hole. It has been argued that GCIRS 7 is a pulsating body, ...
Show more >Context. GCIRS 7, the brightest star in the Galactic central parsec, formed 6 ± 2 Myr ago together with dozens of massive stars in a disk orbiting the central black-hole. It has been argued that GCIRS 7 is a pulsating body, on the basis of photometric variability.Aims. Our goal is to confirm photospheric pulsations based on interferometric size measurements to better understand how the mass loss from these massive stars enriches the local interstellar medium.Methods. We present the first medium-resolution (R = 500), K-band spectro-interferometric observations of GCIRS 7, using the GRAVITY instrument with the four auxiliary telescopes of the ESO VLTI. We looked for variations using two epochs, namely 2017 and 2019.Results. We find GCIRS 7 to be moderately resolved with a uniform-disk photospheric diameter of θUD* = 1.55 ± 0.03 mas (RUD* = 1368 ± 26 R⊙) in the K-band continuum. The narrow-band uniform-disk diameter increases above 2.3 μm, with a clear correlation with the CO band heads in the spectrum. This correlation is aptly modeled by a hot (TL = 2368 ± 37 K), geometrically thin molecular shell with a diameter of θL = 1.74 ± 0.03 mas, as measured in 2017. The shell diameter increased (θL = 1.89 ± 0.03 mas), while its temperature decreased (TL = 2140 ± 42 K) in 2019. In contrast, the photospheric diameter θUD* and the extinction up to the photosphere of GCIRS 7 (AKS = 3.18 ± 0.16) have the same value within uncertainties at the two epochs.Conclusions. In the context of previous interferometric and photo-spectrometric measurements, the GRAVITY data allow for an interpretation in terms of photospheric pulsations. The photospheric diameter measured in 2017 and 2019 is significantly larger than previously reported using the PIONIER instrument (θ* = 1.076 ± 0.093 mas in 2013 in the H band). The parameters of the photosphere and molecular shell of GCIRS 7 are comparable to those of other red supergiants that have previously been studied using interferometry. The extinction we measured here is lower than previous estimates in the direction of GCIRS 7 but typical for the central parsec region.Show less >
Show more >Context. GCIRS 7, the brightest star in the Galactic central parsec, formed 6 ± 2 Myr ago together with dozens of massive stars in a disk orbiting the central black-hole. It has been argued that GCIRS 7 is a pulsating body, on the basis of photometric variability.Aims. Our goal is to confirm photospheric pulsations based on interferometric size measurements to better understand how the mass loss from these massive stars enriches the local interstellar medium.Methods. We present the first medium-resolution (R = 500), K-band spectro-interferometric observations of GCIRS 7, using the GRAVITY instrument with the four auxiliary telescopes of the ESO VLTI. We looked for variations using two epochs, namely 2017 and 2019.Results. We find GCIRS 7 to be moderately resolved with a uniform-disk photospheric diameter of θUD* = 1.55 ± 0.03 mas (RUD* = 1368 ± 26 R⊙) in the K-band continuum. The narrow-band uniform-disk diameter increases above 2.3 μm, with a clear correlation with the CO band heads in the spectrum. This correlation is aptly modeled by a hot (TL = 2368 ± 37 K), geometrically thin molecular shell with a diameter of θL = 1.74 ± 0.03 mas, as measured in 2017. The shell diameter increased (θL = 1.89 ± 0.03 mas), while its temperature decreased (TL = 2140 ± 42 K) in 2019. In contrast, the photospheric diameter θUD* and the extinction up to the photosphere of GCIRS 7 (AKS = 3.18 ± 0.16) have the same value within uncertainties at the two epochs.Conclusions. In the context of previous interferometric and photo-spectrometric measurements, the GRAVITY data allow for an interpretation in terms of photospheric pulsations. The photospheric diameter measured in 2017 and 2019 is significantly larger than previously reported using the PIONIER instrument (θ* = 1.076 ± 0.093 mas in 2013 in the H band). The parameters of the photosphere and molecular shell of GCIRS 7 are comparable to those of other red supergiants that have previously been studied using interferometry. The extinction we measured here is lower than previous estimates in the direction of GCIRS 7 but typical for the central parsec region.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Source :
Submission date :
2021-07-16T03:01:01Z
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