The wonderful complexity of the Mira AB system
Artikel i vetenskaplig tidskrift, 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.

circumstellar matter

binaries: symbiotic

submillimeter: stars

stars: AGB and post-AGB

Författare

S. Ramstedt

Uppsala universitet

S. Mohamed

South African Astronomical Observatory

Wouter Vlemmings

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

Matthias Maercker

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

R. Montez

Vanderbilt University

A. Baudry

Laboratoire d'Astrophysique de Bordeaux

Elvire De Beck

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

Michael Lindqvist

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

Hans Olofsson

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

E. M. Humphreys

European Southern Observatory (ESO)

A. Jorissen

Université libre de Bruxelles (ULB)

F. Kerschbaum

Universität Wien

A. Mayer

Universität Wien

M. Wittkowski

European Southern Observatory (ESO)

N. L. J. Cox

KU Leuven

E. Lagadec

Universite Nice Sophia Antipolis

M. L. Leal-Ferreira

Universität Bonn

C. Paladini

Université libre de Bruxelles (ULB)

A. F. Perez-Sanchez

Universidad Nacional Autonoma de Mexico

S. Sacuto

Uppsala universitet

Astronomy and Astrophysics

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

Vol. 570 Art. no. L14- L14

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.1051/0004-6361/201425029