Disk and wind interaction in the young stellar object MWC 297 spatially resolved with VLTI/AMBER
F. Malbet
(1)
,
M. Benisty
(1)
,
W.J. de Wit
(1)
,
S. Kraus
(2)
,
A. Meilland
(3)
,
F. Millour
(1, 4)
,
E. Tatulli
(1)
,
J.P. Berger
(1)
,
O. Chesneau
(3)
,
K.H. Hofmann
(2)
,
A. Isella
(5)
,
A. Natta
(5)
,
R. Petrov
(4)
,
T. Preibisch
(2)
,
P. Stee
(3)
,
L. Testi
(5)
,
G. Weigelt
(2)
,
P. Antonelli
(3)
,
U. Beckmann
(2)
,
Y. Bresson
(3)
,
A. Chelli
(1)
,
G. Duvert
(1)
,
L. Glück
(1)
,
P. Kern
(1)
,
S. Lagarde
(3)
,
E. Le Coarer
(1)
,
F. Lisi
(5)
,
K. Perraut
(1)
,
S. Robbe-Dubois
(4)
,
A. Roussel
(3)
,
G. Zins
(1)
,
M. Accardo
(5)
,
B. Acke
(1)
,
K. Agabi
(4)
,
B. Arezki
(1)
,
E. Aristidi
(4)
,
C. Baffa
(5)
,
J. Behrend
(2)
,
T. Blöcker
(2)
,
S. Bonhomme
(3)
,
S. Busoni
(5)
,
F. Cassaing
(6)
,
J.-M. Clausse
(3)
,
J. Colin
(3)
,
C. Connot
(2)
,
A. Delboulbé
(1)
,
T. Driebe
(2)
,
M. Dugué
(3)
,
P. Feautrier
(1)
,
D. Ferruzzi
(5)
,
T. Forveille
(1)
,
E. Fossat
(4)
,
Renaud Foy
(7)
,
D. Didier Fraix-Burnet
(1)
,
A. Gallardo
(1)
,
S. Gennari
(5)
,
A. Glentzlin
(3)
,
E. Giani
(5)
,
C. Gil
(1)
,
M. Heiden
(2)
,
M. Heininger
(2)
,
D. Kamm
(3)
,
D. Le Contel
(3)
,
J.-M. Le Contel
(3)
,
B. Lopez
(3)
,
Y. Magnard
(1)
,
A. Marconi
(5)
,
G. Mars
(3)
,
G. Martinot-Lagarde
(3, 8)
,
P. Mathias
(3)
,
J.-L. Monin
(1)
,
D. Mouillet
(1)
,
D. Mourard
(3)
,
P. Mège
(1)
,
E. Nussbaum
(2)
,
K. Ohnaka
(2)
,
J. Pacheco
(3)
,
F. Pacini
(5)
,
C. Perrier
(1)
,
P. Puget
(1)
,
Y. Rabbia
(3)
,
S. Rebattu
(3)
,
François Reynaud
(9)
,
A. Richichi
(10)
,
M. Sacchettini
(1)
,
P. Salinari
(5)
,
D. Schertl
(2)
,
W. Solscheid
(2)
,
P. Stefanini
(5)
,
Michel Tallon
(7)
,
Isabelle Tallon-Bosc
(7)
,
D. Tasso
(3)
,
J.-C. Valtier
(3)
,
M. Vannier
(4, 10)
,
N. Ventura
(1)
,
M. Kiekebusch
(10)
,
F. Rantakyrö
(10)
,
M. Schöller
(10)
1
LAOG -
Laboratoire d'Astrophysique de Grenoble
2 MPIFR - Max-Planck-Institut für Radioastronomie
3 LG - Laboratoire Gemini
4 LUAN - Laboratoire Universitaire d'Astrophysique de Nice
5 OAA - INAF - Osservatorio Astrofisico di Arcetri
6 ONERA - The French Aerospace Lab [Châtillon]
7 CRAL - Centre de Recherche Astrophysique de Lyon
8 DTI - Division technique INSU/SDU
9 PHOTONIQUE
10 ESO - European Southern Observatory
2 MPIFR - Max-Planck-Institut für Radioastronomie
3 LG - Laboratoire Gemini
4 LUAN - Laboratoire Universitaire d'Astrophysique de Nice
5 OAA - INAF - Osservatorio Astrofisico di Arcetri
6 ONERA - The French Aerospace Lab [Châtillon]
7 CRAL - Centre de Recherche Astrophysique de Lyon
8 DTI - Division technique INSU/SDU
9 PHOTONIQUE
10 ESO - European Southern Observatory
M. Benisty
- Fonction : Auteur
- PersonId : 755605
- ORCID : 0000-0002-7695-7605
- IdRef : 130594024
F. Millour
- Fonction : Auteur
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- IdHAL : fmillour
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- IdRef : 113511485
A. Isella
- Fonction : Auteur
- PersonId : 755606
- ORCID : 0000-0001-8061-2207
R. Petrov
- Fonction : Auteur
- PersonId : 741590
- IdHAL : romain-petrov
- ORCID : 0000-0003-4759-6051
P. Stee
- Fonction : Auteur
- PersonId : 744913
- IdHAL : philippe-stee
- ORCID : 0000-0001-8220-0636
- IdRef : 061743798
G. Weigelt
- Fonction : Auteur
- PersonId : 755122
- ORCID : 0000-0001-9754-2233
E. Aristidi
- Fonction : Auteur
- PersonId : 181810
- IdHAL : eric-aristidi
- ORCID : 0000-0001-9886-7670
- IdRef : 229576346
T. Forveille
- Fonction : Auteur
- PersonId : 755407
- ORCID : 0000-0003-0536-4607
- IdRef : 033740585
D. Didier Fraix-Burnet
- Fonction : Auteur
- PersonId : 355
- IdHAL : didier-fraix-burnet
- ORCID : 0000-0002-7418-0513
- IdRef : 076764389
G. Martinot-Lagarde
- Fonction : Auteur
- PersonId : 180707
- IdHAL : gregoire-martinot-lagarde
- ORCID : 0000-0002-2493-4591
- IdRef : 253124107
D. Mourard
- Fonction : Auteur
- PersonId : 755620
- ORCID : 0000-0001-7425-5055
- IdRef : 050203479
A. Richichi
- Fonction : Auteur
- PersonId : 755120
- ORCID : 0000-0002-6554-9884
Michel Tallon
- Fonction : Auteur
- PersonId : 174583
- IdHAL : michel-tallon
- ORCID : 0000-0002-6996-580X
- IdRef : 07042909X
Résumé
The young stellar object MWC 297 is an embedded B1.5Ve star exhibiting strong hydrogen emission lines and a strong near-infrared continuum excess. This object has been observed with the VLT interferometer equipped with the AMBER instrument during its first commissioning run. VLTI/AMBER is currently the only near infrared interferometer which can observe spectrally dispersed visibilities. MWC 297 has been spatially resolved in the continuum with a visibility of $0.50^{+0.08}_{-0.10}$ as well as in the Brgamma emission line where the visibility decrease to a lower value of $0.33\pm0.06$. This change in the visibility with the wavelength can be interpreted by the presence of an optically thick disk responsible for the visibility in the continuum and of a stellar wind traced by the Brgamma emission line and whose apparent size is 40% larger. We validate this interpretation by building a model of the stellar environment that combines a geometrically thin, optically thick accretion disk model consisting of gas and dust, and a latitude-dependent stellar wind outflowing above the disk surface. The continuum emission and visibilities obtained from this model are fully consistent with the interferometric AMBER data. They agree also with existing optical, near-infrared spectra and other broad-band near-infrared interferometric visibilities. We also reproduce the shape of the visibilities in the Brgamma line as well as the profile of this line obtained at an higher spectral resolution with the VLT/ISAAC spectrograph, and those of the Halpha and Hbeta lines. The disk and wind models yield a consistent inclination of the system of approximately 20 degrees. A picture emerges in which MWC 297 is surrounded by an equatorial flat disk that is possibly still accreting and an outflowing wind which has a much higher velocity in the polar region than at the equator. The VLTI/AMBER unique capability to measure spectral visibilities therefore allows us for the first time to compare the apparent geometry of a wind with the disk structure in a young stellar system.
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