Zobrazeno 1 - 10
of 4 286
pro vyhledávání: '"Beck, E"'
The transport of energy through convection is important during many stages of stellar evolution, and is best studied in our Sun or giant evolved stars. Features that are attributed to convection are found on the surface of massive red supergiant star
Externí odkaz:
http://arxiv.org/abs/2409.06785
Autor:
Danilovich, T., Malfait, J., Van de Sande, M., Montargès, M., Kervella, P., De Ceuster, F., Coenegrachts, A., Millar, T. J., Richards, A. M. S., Decin, L., Gottlieb, C. A., Pinte, C., De Beck, E., Price, D. J., Wong, K. T., Bolte, J., Menten, K. M., Baudry, A., de Koter, A., Etoka, S., Gobrecht, D., Gray, M., Herpin, F., Jeste, M., Lagadec, E., Maes, S., McDonald, I., Marinho, L., Müller, H. S. P., Pimpanuwat, B., Plane, J. M. C., Sahai, R., Wallström, S. H. J., Yates, J., Zijlstra, A.
Publikováno v:
Nature Astronomy, 8, pages 308-327 (2024)
Binary interactions have been proposed to explain a variety of circumstellar structures seen around evolved stars, including asymptotic giant branch (AGB) stars and planetary nebulae. Studies resolving the circumstellar envelopes of AGB stars have re
Externí odkaz:
http://arxiv.org/abs/2407.16979
Autor:
Planquart, L., Paladini, C., Jorissen, A., Escorza, A., Pantin, E., Drevon, J., Aringer, B., Baron, F., Chiavassa, A., Cruzalèbes, P., Danchi, W., De Beck, E., Groenewegen, M. A. T., Höfner, S., Hron, J., Khouri, T., Lopez, B., Lykou, F., Montarges, M., Nardetto, N., Ohnaka, K., Olofsson, H., Rau, G., Rosales-Guzmán, A., Sanchez-Bermudez, J., Scicluna, P., Siess, L., Thévenin, F., Van Eck, S., Vlemmings, W. H. T., Weigelt, G., Wittkowski, M.
Publikováno v:
A&A 687, A306 (2024)
Our purpose is to study the effect of binary companions located within the first 10 stellar radii from the primary AGB star. In this work, we target the mass-losing carbon star V Hydrae (V Hya), looking for signatures of its companion in the dust for
Externí odkaz:
http://arxiv.org/abs/2405.07821
Autor:
Maercker, M., De Beck, E., Khouri, T., Vlemmings, W. H. T., Gustafsson, J., Olofsson, H., Tafoya, D., Kerschbaum, F., Lindqvist, M.
Publikováno v:
A&A 687, A112 (2024)
Aims. We aim to resolve the spatial and kinematic sub-structures in five detached-shell sources to provide detailed constraints for hydrodynamic models that describe the formation and evolution of the shells. Methods. We use observations of the 12 CO
Externí odkaz:
http://arxiv.org/abs/2405.01222
Autor:
Khouri, T., Olofsson, H., Vlemmings, W. H. T., Schirmer, T., Tafoya, D., Maercker, M., De Beck, E., Nyman, L. -Å., Saberi, M.
The mass loss experienced on the asymptotic giant branch (AGB) at the end of the lives of low- and intermediate-mass stars is widely accepted to rely on radiation pressure acting on dust grains formed in the extended AGB atmospheres. The interaction
Externí odkaz:
http://arxiv.org/abs/2402.13676
Autor:
Unnikrishnan, R., De Beck, E., Nyman, L. A., Olofsson, H., Vlemmings, W. H. T., Tafoya, D., Maercker, M., Charnley, S. B., Cordiner, M. A., de Gregorio, I., Humphreys, E., Millar, T. J., Rawlings, M. G.
AGB stars are major contributors to the chemical enrichment of the ISM through nucleosynthesis and extensive mass loss. Most of our current knowledge of AGB atmospheric and circumstellar chemistry, in particular in a C-rich environment, is based on o
Externí odkaz:
http://arxiv.org/abs/2312.10014
Publikováno v:
A&A 667, A74 (2022)
Estimating the distances to asymptotic giant branch (AGB) stars using optical measurements of their parallaxes is not straightforward because of the large uncertainties introduced by their dusty envelopes, their large angular sizes, and their surface
Externí odkaz:
http://arxiv.org/abs/2209.03906
We aim to constrain the dust mass and grain sizes in the interaction regions between the stellar winds and the ISM around asymptotic giant branch stars. By describing the dust in these regions, we aim to shed light on the role of low mass evolved sta
Externí odkaz:
http://arxiv.org/abs/2204.13440
Autor:
Gottlieb, C. A., Decin, L., Richards, A. M. S., De Ceuster, F., Homan, W., Wallstrom, S. H. J., Danilovich, T., Millar, T. J., Montarges, M., Wong, K. T., McDonald, I., Baudry, A., Bolte, J., Cannon, E., De Beck, E., de Koter, A., Mellah, I. El, Etoka, S., Gobrecht, D., Gray, M., Herpin, F., Jeste, M., Kervella, P., Khouri, T., Lagadec, E., Maes, S., Malfait, J., Menten, K. M., Muller, H. S. P., Pimpanuwat, B., Plane, J. M. C., Sahai, R., Van de Sande, M., Waters, L. B. F. M., Yates, J., Zijlstra, A.
Publikováno v:
A&A 660, A94 (2022)
This overview paper presents ATOMIUM, a Large Programme in Cycle 6 with the Atacama Large Millimeter-submillimeter Array (ALMA). The goal of ATOMIUM is to understand the dynamics and the gas phase and dust formation chemistry in the winds of evolved
Externí odkaz:
http://arxiv.org/abs/2112.04399
Autor:
Danilovich, T., Van de Sande, M., Plane, J. M. C., Millar, T. J., Royer, P., Amor, M. A., Hammami, K., Decock, L., Gottlieb, C. A., Decin, L., Richards, A. M. S., De Beck, E., Baudry, A., Bolte, J., Cannon, E., De Ceuster, F., de Koter, A., Etoka, S., Gobrecht, D., Gray, M., Herpin, F., Homan, W., Jeste, M., Kervella, P., Khouri, T., Lagadec, E., Maes, S., Malfait, J., McDonald, I., Menten, K. M., Montargès, M., Müller, H. S. P., Pimpanuwat, B., Sahai, R., Wallström, S. H. J., Waters, L. B. F. M., Wong, K. T., Yates, J., Zijlstra, A.
Publikováno v:
A&A 655, A80 (2021)
S-type asymptotic giant branch (AGB) stars are thought to be intermediates in the evolution of oxygen- to carbon-rich AGB stars. The chemical compositions of their circumstellar envelopes are also intermediate, but have not been studied in as much de
Externí odkaz:
http://arxiv.org/abs/2109.04747