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The wonderful complexity of the Mira AB system

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arxiv 1410.1529 v1 pith:7CIJFQ2V submitted 2014-10-06 astro-ph.SR

The wonderful complexity of the Mira AB system

S. Ramstedt , S. Mohamed , W. H. T. Vlemmings , M. Maercker , R. Montez , A. Baudry , E. De Beck , M. Lindqvist
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H. Olofsson E. M. L. Humphreys A. Jorissen F. Kerschbaum A. Mayer M. Wittkowski N. L. J. Cox E. Lagadec M. L. Leal-Ferreira C. Paladini A. P\'erez-S\'anchez S. Sacuto
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We have mapped the CO(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$\pm$0.006 separation. In the main line component, centered on the stellar velocity, spiral arcs around Mira A are found. The spiral appears to be relatively flat and oriented in the orbital plane. An accretion wake behind the companion is clearly visible and the projected arc separation is of order 5''. In the blue wing of the line emission, offset from the main line, several large ($\sim$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.

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