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| Paper: |
Shaping the Outflows of Binary AGB Stars |
| Volume: |
497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time |
| Page: |
187 |
| Authors: |
Ramstedt, S.; Vlemmings, W. H. T.; Mohamed, S. |
| Abstract: |
The required conditions for stars to evolve into planetary nebulae (PNe)
continue to puzzle. Since PNe are found in a wide variety of shapes,
processes that could sculpt circumstellar envelopes (CSEs) are being
investigated. A binary companion will have a strong gravitational
effect, but known binary AGB stars are rare. We have observed
the CO emission from a small sample of known binary AGB stars
(R Aqr, Mira, W Aql, and π1 Gru) with ALMA.
The stars cover a decisive range in binary
separation, necessary to provide essential constraints for 3-D models
of the binary interaction. They have previously been observed with
Herschel/PACS and VLTI/MIDI allowing the circumstellar morphology
to be studied from the very inner CSE out to the very largest scales.
The circumstellar gas distribution will strongly depend on how the mass
is initially lost from the primary. These observations will therefore
not only help us understand the important processes for the binary
interaction, but will also provide crucial information needed to
understand the mass-loss mechanisms of the primary. The first set of
observations has been delivered and preliminary results are presented. |
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