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ALMA Observations of Anisotropic Dust Mass Loss around VY CMa

Eamon O'Gorman (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; Wouter Vlemmings (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; A. M. S. Richards ; A. Baudry ; Elvire De Beck (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; L. Decin ; G. M. Harper ; E. M. Humphreys ; P. Kervella ; Theo Khouri (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; Sebastien Muller (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium)
4th ALMA Science Conference on Revolution in Astronomy with ALMA: The Third Year, Tokyo, Japan, 8-11 December Vol. 499 (2015), p. 335-336.
[Konferensbidrag, refereegranskat]

We present high resolution ALMA Science Verification data of the continuum emission around the highly evolved oxygen-rich red supergiant VY CMa. These data enable us to study the dust in its inner circumstellar environment at a spatial resolution of 129 mas at 321 GHz and 59 mas at 658 GHz, thus allowing us to trace dust on spatial scales down to 11 R-star (71 AU). Two prominent dust components are detected and resolved. We find that at least 17% of the dust mass around VY CMa is located in clumps ejected within a more quiescent roughly spherical stellar wind, with a quiescent dust mass loss rate of 5 x 10(-6) M-circle dot yr(-1). The anisotropic morphology of the dust indicates a continuous, directed mass loss over a few decades, suggesting that this mass loss cannot be driven by large convection cells alone.



Denna post skapades 2016-03-02.
CPL Pubid: 232651