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Rotation of the asymptotic giant branch star R Doradus

Vlemmings, Wouter, 1974 (author)
Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden
Khouri, Theo, 1985 (author)
Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden
De Beck, Elvire, 1985 (author)
Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden
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Olofsson, Hans, 1952 (author)
Chalmers tekniska högskola,Chalmers University of Technology,Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden
Garcia-Segura, G. (author)
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
Villaver, E. (author)
Universidad Autonoma de Madrid (UAM),Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain
Baudry, A. (author)
Université de Bordeaux,University of Bordeaux,Univ Bordeaux, CNRS, Lab Astrophys Bordeaux, B18N, Allee Geoffroy St Hilaire, F-33615 Pessac, France
Humphreys, E. M. L. (author)
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
Maercker, Matthias, 1979 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Ramstedt, Sofia (author)
Uppsala universitet,Institutionen för fysik och astronomi
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 (creator_code:org_t)
2018-05-23
2018
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 613
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  • Journal article (peer-reviewed)
Abstract Subject headings
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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.

Subject headings

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)
NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)

Keyword

stars: AGB and post-AGB
stars: rotation

Publication and Content Type

art (subject category)
ref (subject category)

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