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| Paper: |
TX Psc and X Her: Two Cases of Stellar Wind-ISM Interaction |
| Volume: |
445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants |
| Page: |
595 |
| Authors: |
Jorissen, A.; Mayer, A.; Van Eck, S.; Ottensamer, R.; Kerschbaum, F.; Ueta, T.; Blommaert, J. A. D. L.; Groenewegen, M. A. T.; Hron, J.; Nowotny, W.; Olofsson, H.; Posch, Th.; Waelkens, C. |
| Abstract: |
The Asymptotic Giant Branch (AGB) stars X Her and TX Psc have been imaged
at 70 and 160 μm with the PACS instrument on-board the Herschel
satellite, as part of the large MESS (Mass loss of Evolved StarS)
Guaranteed Time Key Program. The images reveal axisymmetric extended
structures with their axes oriented along the stars’ space motion. This
extended structure very likely originates in the interaction of the
wind ejected by the AGB star with the surrounding interstellar medium
(ISM). As predicted by former numerical simulations, the detailed
structure of the wind–ISM interface depends upon the relative velocity
between star+wind and the ISM, which is large for these two stars
(56 and 108 km s-1 for TX Psc and X Her, respectively). In both
cases, there is a compact blob upstream whose origin is not fully
elucidated. |
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