Ref: ASTROimport-866

Winds of Binary AGB Stars as Observed by Herschel

Mayer, A. ; Jorissen, A. ; Kerschbaum, F. ; Ottensamer, R. ; Mecina, M. ; Paladini, C. ; Cox, N. L. J. ; Nowotny, W. ; Aringer, B. ; Pourbaix, D. ; Mohamed, S. ; Siopis, C. ; Groenewegen, M. A. T.

published in Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time, 497, pp. 181 (2015)

Abstract: We present Herschel/PACS observations of the large-scale environments of binary AGB stars as part of the Mass-loss of Evolved StarS (MESS) sample. From the literature we found 18 of the objects to be members of physically bound multiple systems. Several show a large-scale far-IR emission which differs significantly from spherical symmetry. A probable cause is the gravitational force of the companion on the stellar AGB wind and the mass-losing star itself. A spiral pattern is thereby imprinted in the dusty stellar wind. The most remarkable structures are found around o Ceti, W Aquilæ, R Aquarii, and p1 Gruis. The environments of o Cet and W Aql show a spiral pattern while the symbiotic nature of R Aqr is revealed as two opposing arms which reflect a nova outburst. The emission around p1 Gru is dominated by two structures, a disk and an arc, which are presumably not caused by the same companion. We found evidence that p1 Gru is a hierarchical triple system in which a close companion attracts the AGB wind onto the orbital plane and the outer companion forms a spiral arm. These far-IR observations underline the role of a companion as a major external influence in creating asymmetric winds in the AGB phase, even before the star becomes a planetary nebula (PN).

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The record appears in these collections:
Royal Observatory of Belgium > Astronomy & Astrophysics
Science Articles > Non-refereed Articles

 Record created 2016-07-01, last modified 2016-07-01