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 Autonoma de Mexico

S. Sacuto

Uppsala University

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 570 Art. no. L14- L14

Magnetic fields and the outflows during the formation and evolution of stars (OUTFLOWMAGN)

European Commission (FP7), 2014-05-01 -- 2019-04-30.

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.1051/0004-6361/201425029

More information

Latest update

5/29/2018