The wonderful complexity of the Mira AB system

S. Ramstedt S. Mohamed W. H. T. Vlemmings M. Maercker R. Montez Alain Baudry 1 E. De Beck M. Lindqvist H. Olofsson 2 E. M. L. Humphreys A. Jorissen F. Kerschbaum A. Mayer M. Wittkowski 3 N. L. J. Cox Erwan Lagadec 3 M. L. Leal-Ferreira C. Paladini A. Pérez-Sánchez S. Sacuto
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
Abstract : 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.
Type de document :
Article dans une revue
Astronomy and Astrophysics - A&A, EDP Sciences, 2014, 570, 〈10.1051/0004-6361/201425029〉
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Contributeur : Marie-Paule Pomies <>
Soumis le : lundi 13 octobre 2014 - 08:16:50
Dernière modification le : jeudi 11 janvier 2018 - 06:26:59

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S. Ramstedt, S. Mohamed, W. H. T. Vlemmings, M. Maercker, R. Montez, et al.. The wonderful complexity of the Mira AB system. Astronomy and Astrophysics - A&A, EDP Sciences, 2014, 570, 〈10.1051/0004-6361/201425029〉. 〈hal-01074109〉



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