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Rotation of the asy...
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Vlemmings, Wouter,1974Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden
(author)
Rotation of the asymptotic giant branch star R Doradus
- Article/chapterEnglish2018
Publisher, publication year, extent ...
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2018-05-23
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EDP Sciences,2018
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electronicrdacarrier
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LIBRIS-ID:oai:research.chalmers.se:a4f153f6-832c-4fbe-9f7b-714f4cb9105d
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https://doi.org/10.1051/0004-6361/201832929DOI
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https://research.chalmers.se/publication/504040URI
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https://research.chalmers.se/publication/503493URI
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-357271URI
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
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High-resolution observations of the extended atmospheres of asymptotic giant branch (AGB) stars can now directly be compared to the theories that describe stellar mass loss. Using Atacama Large Millimeter/submillimeter Array (ALMA) high angular resolution (30 x 42 mas) observations, we have for the first time resolved stellar rotation of an AGB star, R Dor. We measure an angular rotation velocity of omega(R) sin i = (3.5 +/- 0.3) x 10(-9) rad s(-1), which indicates a rotational velocity of vertical bar nu(rot) sin i vertical bar = 1.0 +/- 0.1 km s(-1) at the stellar surface (R-* = 31.2 mas at 214 GHz). The rotation axis projected on the plane of the sky has a position angle Phi = 7 +/- 6 degrees. We find that the rotation of R Dor is two orders of magnitude faster than expected for a solitary AGB star that will have lost most of its angular momentum. Its rotational velocity is consistent with angular momentum transfer from a close companion. As a companion has not been directly detected, we suggest R Dor has a low-mass, close-in companion. The rotational velocity approaches the critical velocity, set by the local sound speed in the extended envelope, and is thus expected to affect the mass-loss characteristics of R Dor.
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Khouri, Theo,1985Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden(Swepub:cth)theok
(author)
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De Beck, Elvire,1985Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden(Swepub:cth)elvire
(author)
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Olofsson, Hans,1952Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden(Swepub:cth)hanolo
(author)
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Garcia-Segura, G.Universidad Nacional Autónoma de México (UNAM),Universidad Nacional Autonoma de Mexico,Univ Nacl Autonoma Mexico, Inst Astron, Km 107 Carr Tijuana Ensenada, Ensenada 22860, BC, Mexico
(author)
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Villaver, E.Universidad Autonoma de Madrid (UAM),Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain
(author)
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Baudry, A.Université de Bordeaux,University of Bordeaux,Univ Bordeaux, CNRS, Lab Astrophys Bordeaux, B18N, Allee Geoffroy St Hilaire, F-33615 Pessac, France
(author)
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Humphreys, E. M. L.European Southern Observatory Santiago,European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany,Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden
(author)
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Maercker, Matthias,1979Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)maercker
(author)
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Ramstedt, SofiaUppsala universitet,Institutionen för fysik och astronomi(Swepub:uu)sofra336
(author)
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Chalmers tekniska högskolaChalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden
(creator_code:org_t)
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In:Astronomy and Astrophysics: EDP Sciences6130004-63611432-0746
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