Výsledky vyhledávání - "Matthias Maercker"

DEATHSTAR: nearby AGB stars with the Atacama Compact Array II. CO envelope sizes and asymmetries: the S-type stars

Autor: M. Andriantsaralaza, Raghvendra Sahai, Taissa Danilovich, Sofia Ramstedt, Hans Olofsson, Martin Groenewegen, Maryam Saberi, Susanne Höfner, Franz Kerschbaum, E. De Beck, Albert A. Zijlstra, Matthias Maercker, Theo Khouri, G. Quintana-Lacaci, Wouter Vlemmings, Michael Lindqvist

Publikováno v: Astronomy and Astrophysics
Digital.CSIC. Repositorio Institucional del CSIC
instname

25 pags., 15 figs., 4 tabs.
Aims. We aim to constrain the sizes of, and investigate deviations from spherical symmetry in, the CO circumstellar envelopes (CSEs) of 16 S-type stars, along with an additional 7 and 4 CSEs of C-type and M-type AGB s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::445b75147d15391af3190794b4d381a0
https://lirias.kuleuven.be/handle/123456789/682658

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Heavy-element Rydberg transition line emission from the post-giant-evolution star HD101584

Autor: S. Ramstedt, L.-Å. Nyman, John H. Black, Matthias Maercker, Daniel Tafoya, Theo Khouri, Wouter Vlemmings, Hans Olofsson, E. M. L. Humphreys, Michael Lindqvist

We report the detection of two lines at millimetre wavelengths towards the immediate surroundings of the post-giant and most likely post-common-envelope star HD101584 using high-angular-resolution ALMA observations. The circumstellar environment of t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b4025a52e8e4b8ab6d96bdd80a6ff134

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DEATHSTAR: Nearby AGB stars with the Atacama Compact Array: I. CO envelope sizes and asymmetries: A new hope for accurate mass-loss-rate estimates

Autor: Matthias Maercker, Franz Kerschbaum, Martin Groenewegen, Hans Olofsson, Susanne Höfner, Daniel Tafoya, L. Doan, Rodolfo Montez, Theo Khouri, Taissa Danilovich, Wouter Vlemmings, E. De Beck, Raghvendra Sahai, Albert A. Zijlstra, Sofia Ramstedt, G. Quintana-Lacaci, Maryam Saberi, Michael Lindqvist, Joel H. Kastner

Publikováno v: Digital.CSIC. Repositorio Institucional del CSIC
instname

28 pags., 10 figs., 7 tabs.
Context. This is the first publication from the DEATHSTAR project. The overall goal of the project is to reduce the uncertainties of the observational estimates of mass-loss rates from evolved stars on the Asymptotic

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fcd50482661c701840561fecf9cc9d5f
http://hdl.handle.net/10261/224210

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Inner dusty envelope of the AGB stars W Hydrae, SW Virginis, and R Crateris using SPHERE/ZIMPOL

Autor: Pierre Kervella, Claudia Paladini, Matthias Maercker, A. de Koter, Wouter Vlemmings, Christian Ginski, Eric Lagadec, L. B. F. M. Waters, E. De Beck, Leen Decin, Theo Khouri

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2020, 635, pp.A200. ⟨10.1051/0004-6361/201834618⟩
Astronomy & Astrophysics, 635:A200. EDP Sciences
Astronomy & Astrophysics, 635, A200

Stars with initial masses between $\sim0.8$ and 8~$M_\odot$ present copious mass loss during the asymptotic giant branch (AGB) at the end of their lives. The accepted mass-loss mechanism requires radiation pressure acting on dust grains that form in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::84245c6b3fcee5f048dc53a2c9fed8a2
https://lirias.kuleuven.be/handle/123456789/654046

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Imaging the dust and the gas around Mira using ALMA and SPHERE/ZIMPOL

Autor: Christian Ginski, Hans Olofsson, Wouter Vlemmings, Elvire De Beck, Theo Khouri, Matthias Maercker, Sofia Ramstedt

Publikováno v: Proceedings of the International Astronomical Union. 14:31-35

The mass-loss mechanism of asymptotic giant branch stars has long been thought to rely on two processes: stellar pulsations and dust formation. The details of the mass-loss mechanism have remained elusive, however, because of the overall complexity o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1ffabf979aec7490593d0a2e41be2666
https://doi.org/10.1017/s1743921318006245

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The extended molecular envelope of the asymptotic giant branch star $\pi^{1}$ Gruis as seen by ALMA II. The spiral-outflow observed at high-angular resolution

Autor: L. Doan, Michael Lindqvist, Wouter Vlemmings, Franz Kerschbaum, Claudia Paladini, S. Höfner, S. Mohamed, S. Ramstedt, E. De Beck, Matthias Maercker, Markus Wittkowski

The AGB star $\pi^{1}$ Gruis has a known companion (at a separation of ~400 AU) which cannot explain the strong deviations from the spherical symmetry of the CSE. Recently, hydrodynamic simulations of mass transfer in closer binary systems have succe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7e210173045332bf5a59320f4b9ce691
http://arxiv.org/abs/1911.10756

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ALMA observations of the vibrationally excited rotational CO transitionv= 1,J= 3 − 2 towards five AGB stars

Autor: E. De Beck, Wouter Vlemmings, Sofia Ramstedt, Robin Lombaert, Matthias Maercker, Theo Khouri

Publikováno v: Monthly Notices of the Royal Astronomical Society: Letters. 463:L74-L78

We report the serendipitous detection with ALMA of the vibrationally-excited pure-rotational CO transition $v=1, J=3-2$ towards five asymptotic giant branch (AGB) stars, $o$ Cet, R Aqr, R Scl, W Aql, and $\pi^1$ Gru. The observed lines are formed in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c277add80cc6b3fc45fefbdc78568e6
https://doi.org/10.1093/mnrasl/slw161

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VLTI/PIONIER reveals the close environment of the evolved system HD 101584

Autor: Wouter Vlemmings, Michael Lindqvist, Jacques Kluska, Matthias Maercker, Daniel Tafoya, H. Van Winckel, E. M. L. Humphreys, Hans Olofsson, Markus Wittkowski, Sofia Ramstedt, W. J. de Wit, Theo Khouri

Publikováno v: Astronomy & Astrophysics. 642:A152

Context: The observed orbital characteristics of post-asymptotic giant branch (post-AGB) and post-red giant branch (post-RGB) binaries are not understood. We suspect that the missing ingredients to explain them probably lie in the continuous interact

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4dddfc059ea1b821464fb540162b3b03
https://doi.org/10.1051/0004-6361/202037946

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Rotation of the asymptotic giant branch star R Doradus

Autor: Hans Olofsson, Theo Khouri, Alain Baudry, Elizabeth Humphreys, E. De Beck, Wouter Vlemmings, Guillermo Garcia-Segura, Matthias Maercker, Sofia Ramstedt, Eva Villaver

Publikováno v: Astronomy and Astrophysics (0004-6361) vol.613(2018)
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2018, pp.id.L4. ⟨10.1051/0004-6361/201832929⟩

High resolution observations of the extended atmospheres of asymptotic giant branch (AGB) stars can now directly confront the theories that describe stellar mass loss. Using Atacama Large Millimeter/submillimeter Array (ALMA) high angular resolution

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7ece1a8304d3a26fe7f7dd16f5dd8642
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-357271

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ALMA observations of the 'fresh' carbon-rich AGB star TX Piscium. The discovery of an elliptical detached shell

Autor: M. Mecina, Ernst A. Dorfi, M. Brunner, Hans Olofsson, Franz Kerschbaum, Matthias Maercker, Gioia Rau

Aims. The carbon-rich asymptotic giant branch (AGB) star TX Piscium (TX Psc) has been observed multiple times during multiple epochs and at different wavelengths and resolutions, showing a complex molecular CO line profile and a ring-like structure i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5f48f38d133d60c2b322bd67b7c23072

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