Zobrazeno 1 - 10
of 674
pro vyhledávání: '"Vlemmings, W."'
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:
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
Publikováno v:
A&A 686, A274 (2024)
Polarisation observations of masers in the circumstellar envelopes (CSEs) around Asymptotic Giant Branch (AGB) stars have revealed strong magnetic fields. However, masers probe only specific lines-of-sight through the CSE. Non-masing molecular line p
Externí odkaz:
http://arxiv.org/abs/2404.01681
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
Massive galaxies are expected to grow through different transformative evolutionary phases where high-redshift starburst galaxies and quasars are examples of such phases. The physical mechanisms driving these phases include companion galaxy interacti
Externí odkaz:
http://arxiv.org/abs/2305.03812
Autor:
Surcis, G., Vlemmings, W. H. T., Goddi, C., Torrelles, J. M., Gómez, J. F., Rodríguez-Kamenetzky, A., Carrasco-González, C., Curiel, S., Kim, S. -W., Kim, J. -S., van Langevelde, H. J.
Publikováno v:
A&A 673, A10 (2023)
Several radio sources have been detected in the HMSFR W75N(B), among them the massive YSOs VLA1 and VLA2 are of great interest. These are thought to be in different evolutionary stages. In particular, VLA1 is at the early stage of the photoionization
Externí odkaz:
http://arxiv.org/abs/2303.00019
Autor:
Vlemmings, W. H. T., Tafoya, D.
Publikováno v:
A&A 671, A117 (2023)
(abridged) The role of magnetic field in the shaping of Planetary Nebulae (PNe), either directly or indirectly after being enhanced by binary interaction, has long been a topic of debate. Large scale magnetic fields around pre-PNe have been inferred
Externí odkaz:
http://arxiv.org/abs/2302.01112
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