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.
submillimeter: stars
binaries: symbiotic
circumstellar matter
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
Université Nice Sophia Antipolis (UNS)
M. L. Leal-Ferreira
Universität Bonn
C. Paladini
Université libre de Bruxelles (ULB)
A. F. Perez-Sanchez
Universidad Nacional Autónoma de México
S. Sacuto
Uppsala universitet
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)
Europeiska kommissionen (EU) (EC/FP7/614264), 2014-05-01 -- 2019-04-30.
Ämneskategorier
Astronomi, astrofysik och kosmologi
DOI
10.1051/0004-6361/201425029