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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 ...

  • 2018-05-23
  • EDP Sciences,2018
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:a4f153f6-832c-4fbe-9f7b-714f4cb9105d
  • https://doi.org/10.1051/0004-6361/201832929DOI
  • https://research.chalmers.se/publication/504040URI
  • https://research.chalmers.se/publication/503493URI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-357271URI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • 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)
  • 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)
  • 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)
  • 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)
  • Villaver, E.Universidad Autonoma de Madrid (UAM),Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain (author)
  • Baudry, A.Université de Bordeaux,University of Bordeaux,Univ Bordeaux, CNRS, Lab Astrophys Bordeaux, B18N, Allee Geoffroy St Hilaire, F-33615 Pessac, France (author)
  • 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)
  • Maercker, Matthias,1979Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)maercker (author)
  • Ramstedt, SofiaUppsala universitet,Institutionen för fysik och astronomi(Swepub:uu)sofra336 (author)
  • Chalmers tekniska högskolaChalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden (creator_code:org_t)

Related titles

  • In:Astronomy and Astrophysics: EDP Sciences6130004-63611432-0746

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