The wonderful complexity of the Mira AB system
Journal article, 2014
We have mapped the (CO)-C-12(3-2) line emission around the Mira AB system at 0 ''.5 resolution using the Atacama Large Millimeter/submillimeter Array (ALMA). The CO map shows amazing complexity. The circumstellar gas has been shaped by different dynamical actors during the evolution of the system, and several morphological components can be identified. The companion is marginally resolved in continuum emission and is currently at 0 ''.487 +/- 0 ''.006 separation. In the main line component, centered on the stellar velocity, spiral arcs around Mira A are found. The spiral appears to be relatively flat and oriented in the orbital plane. An accretion wake behind the companion is clearly visible, and the projected arc separation is about 5 ''. In the blue wing of the line emission, offset from the main line, several large (similar to 5-10 '') opposing arcs are found. We tentatively suggest that this structure is created by the wind of Mira B blowing a bubble in the expanding envelope of Mira A.
submillimeter: stars
binaries: symbiotic
circumstellar matter
stars: AGB and post-AGB
Author
S. Ramstedt
Uppsala University
S. Mohamed
South African Astronomical Observatory
Wouter Vlemmings
Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics
Matthias Maercker
Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics
R. Montez
Vanderbilt University
A. Baudry
Laboratoire d'Astrophysique de Bordeaux
Elvire De Beck
Chalmers, Earth and Space Sciences, Onsala Space Observatory
Michael Lindqvist
Chalmers, Earth and Space Sciences, Onsala Space Observatory
Hans Olofsson
Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics
E. M. Humphreys
European Southern Observatory (ESO)
A. Jorissen
Université libre de Bruxelles (ULB)
F. Kerschbaum
University of Vienna
A. Mayer
University of Vienna
M. Wittkowski
European Southern Observatory (ESO)
N. L. J. Cox
KU Leuven
E. Lagadec
Université Nice Sophia Antipolis (UNS)
M. L. Leal-Ferreira
University of Bonn
C. Paladini
Université libre de Bruxelles (ULB)
A. F. Perez-Sanchez
Universidad Nacional Autónoma de México
S. Sacuto
Uppsala University
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 570 Art. no. L14- L14Magnetic fields and the outflows during the formation and evolution of stars (OUTFLOWMAGN)
European Commission (EC) (EC/FP7/614264), 2014-05-01 -- 2019-04-30.
Subject Categories
Astronomy, Astrophysics and Cosmology
DOI
10.1051/0004-6361/201425029