Weigelt, G., Hofmann, K. -H., Schertl, D., Lopez, B., Petrov, R. G., Lagarde, S., Berio, Ph., Jaffe, W., Henning, Th., Millour, F., Meilland, A., Allouche, F., Robbe-Dubois, S., Matter, A., Cruzalebes, P., Hillier, D. J., Russell, C. M. P., Madura, T., Gull, T. R., Corcoran, M. F., Damineli, A., Moffat, A. F. J., Morris, P. W., Richardson, N. D., Paladini, C., Schoeller, M., Merand, A., Glindemann, A., Beckmann, U., Heininger, M., Bettonvil, F., Zins, G., Woillez, J., Bristow, P., Sanchez-Bermudez, J., Ohnaka, K., Kraus, S., Mehner, A., Wittkowski, M., Hummel, C. A., Stee, P., Vakili, F., Hartman, H., Navarete, F., Hamaguchi, K., Espinoza-Galeas, D. A., Stevens, I. R., van Boekel, R., Wolf, S., Hogerheijde, M. R., Dominik, C., Augereau, J. -C., Pantin, E., Waters, L. B. F. M., Meisenheimer, K., Varga, J., Klarmann, L., Gamez Rosas, V., Burtscher, L., Leftley, J., Isbell, J. W., Hocde, V., Yoffe, G., Kokoulina, E., Hron, J., Groh, J., Kreplin, A., Rivinius, Th., de Wit, W. -J., Danchi, W. -C., Domiciano de Souza, A., Drevon, J., Labadie, L., Connot, C., Nussbaum, E., Lehmitz, M., Antonelli, P., Graser, U. and Leinert, C. (2021). VLTI-MATISSE chromatic aperture-synthesis imaging of eta Carinae's stellar wind across the Br alpha line Periastron passage observations in February 2020. Astron. Astrophys., 652. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Context. Eta Carinae is a highly eccentric, massive binary system (semimajor axis similar to 15.5 au) with powerful stellar winds and a phase-dependent wind-wind collision (WWC) zone. The primary star, eta Car A, is a luminous blue variable (LBV); the secondary, eta Car B, is a Wolf-Rayet or O star with a faster but less dense wind. Aperture-synthesis imaging allows us to study the mass loss from the enigmatic LBV eta Car. Understanding LBVs is a crucial step toward improving our knowledge about massive stars and their evolution. Aims. Our aim is to study the intensity distribution and kinematics of eta Car's WWC zone. Methods. Using the VLTI-MATISSE mid-infrared interferometry instrument, we perform Br alpha imaging of eta Car's distorted wind. Results. We present the first VLTI-MATISSE aperture-synthesis images of eta Car A's stellar windin several spectral channels distributed across the Br alpha 4.052 mu m line (spectral resolving power R similar to 960). Our observations were performed close to periastron passage in February 2020 (orbital phase similar to 14.0022). The reconstructed iso-velocity images show the dependence of the primary stellar wind on wavelength or line-of-sight (LOS) velocity with a spatial resolution of 6 mas (similar to 14 au). The radius of the faintest outer wind regions is similar to 26 mas (similar to 60 au). At several negative LOS velocities, the primary stellar wind is less extended to the northwest than in other directions. This asymmetry is most likely caused by the WWC. Therefore, we see both the velocity field of the undisturbed primary wind and the WWC cavity. In continuum spectral channels, the primary star wind is more compact than in line channels. A fit of the observed continuum visibilities with the visibilities of a stellar wind CMFGEN model (CMFGEN is an atmosphere code developed to model the spectra of a variety of objects) provides a full width at half maximum fit diameter of the primary stellar wind of 2.84 +/- 0.06 mas (6.54 +/- 0.14 au). We comparethe derived intensity distributions with the CMFGEN stellar wind model and hydrodynamic WWC models.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Weigelt, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hofmann, K. -H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schertl, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lopez, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Petrov, R. G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lagarde, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Berio, Ph.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jaffe, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Henning, Th.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Millour, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meilland, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Allouche, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Robbe-Dubois, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Matter, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cruzalebes, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hillier, D. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Russell, C. M. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Madura, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gull, T. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Corcoran, M. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Damineli, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moffat, A. F. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Morris, P. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Richardson, N. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Paladini, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schoeller, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Merand, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Glindemann, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beckmann, U.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Heininger, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bettonvil, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zins, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Woillez, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bristow, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sanchez-Bermudez, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ohnaka, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kraus, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mehner, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wittkowski, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hummel, C. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stee, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vakili, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hartman, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Navarete, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hamaguchi, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Espinoza-Galeas, D. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stevens, I. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van Boekel, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wolf, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hogerheijde, M. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dominik, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Augereau, J. -C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pantin, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Waters, L. B. F. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meisenheimer, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Varga, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klarmann, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gamez Rosas, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Burtscher, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Leftley, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Isbell, J. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hocde, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yoffe, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kokoulina, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hron, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Groh, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kreplin, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rivinius, Th.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
de Wit, W. -J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Danchi, W. -C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Domiciano de Souza, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Drevon, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Labadie, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Connot, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nussbaum, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lehmitz, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Antonelli, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Graser, U.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Leinert, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-607492
DOI: 10.1051/0004-6361/202141240
Journal or Publication Title: Astron. Astrophys.
Volume: 652
Date: 2021
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
COLLIDING WINDS; COLLISION ZONE; LIGHT-CURVE; MASS-LOSS; STAR; COMPANION; VELOCITY; SHAPE; INNER; INTERFEROMETERMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/60749

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