000002245 001__ 2245
000002245 005__ 20160706142929.0
000002245 0247_ $$2DOI$$a10.1051/0004-6361/201116927
000002245 037__ $$aASTROimport-402
000002245 100__ $$aJorissen, A.
000002245 245__ $$aX Herculis and TX Piscium: two cases of ISM interaction with stellar winds observed by Herschel
000002245 260__ $$c2011
000002245 520__ $$aThe asymptotic giant branch (AGB) stars X Her and TX Psc have been imaged at 70 and 160 µm with the PACS instrument onboard the Herschel satellite, as part of the large MESS (Mass loss of Evolved StarS) guaranteed time key program. The images reveal an axisymmetric extended structure with its axis oriented along the space motion of the stars. This extended structure is very likely to be shaped by the interaction of the wind ejected by the AGB star with the surrounding interstellar medium (ISM). As predicted by numerical simulations, the detailed structure of the wind-ISM interface depends upon the relative velocity between star+wind and the ISM, which is large for these two stars (108 and 55 km s-1 for X Her and TX Psc, respectively). In both cases, there is a compact blob upstream whose origin is not fully elucidated, but that could be the signature of some instability in the wind-ISM shock. Deconvolved images of X Her and TX Psc reveal several discrete structures along the outermost filaments, which could be Kelvin-Helmholtz vortices. Finally, TX Psc is surrounded by an almost circular ring (the signature of the termination shock?) that contrasts with the outer, more structured filaments. A similar inner circular structure seems to be present in X Her as well, albeit less clearly. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
000002245 700__ $$aMayer, A.
000002245 700__ $$avan Eck, S.
000002245 700__ $$aOttensamer, R.
000002245 700__ $$aKerschbaum, F.
000002245 700__ $$aUeta, T.
000002245 700__ $$aBergman, P.
000002245 700__ $$aBlommaert, J. A. D. L.
000002245 700__ $$aDecin, L.
000002245 700__ $$aGroenewegen, M. A. T.
000002245 700__ $$aHron, J.
000002245 700__ $$aNowotny, W.
000002245 700__ $$aOlofsson, H.
000002245 700__ $$aPosch, T.
000002245 700__ $$aSjouwerman, L. O.
000002245 700__ $$aVandenbussche, B.
000002245 700__ $$aWaelkens, C.
000002245 773__ $$cA135$$pAstronomy and Astrophysics$$v532$$y2011
000002245 85642 $$ahttp://esoads.eso.org/abs/2011A%26A...532A.135J
000002245 905__ $$apublished in
000002245 980__ $$aREFERD