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H2O Isotopologues in Extreme OH/IR Stars

Kay Justtanont (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; M. J. Barlow ; Jadl Blommaert ; L. Decin ; F. Kerschbaum ; M. Matsuura ; Hans Olofsson (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; B. Swinyard ; D. Teyssier ; Lbfm Waters ; J. Yates
Astronomical Society of the Pacific Conference Series: Conference on Why Galaxies Care About AGB Stars III: A Closer Look in Space and Time, Vienna, Austria, JUL 28-AUG 01, 2014 Vol. 497 (2015), p. 85-89.
[Konferensbidrag, refereegranskat]

Using Herschel Space Observatory we we observed isotopologues of H2O in extreme OH/IR stars. We detected strong (H2O)-O-16 and (H2O)-O-17 while the (H2O)-O-18 lines are missing, contrary to the overall galactic oxygen abundance in the interstellar medium and the Sun, where O-18 is more abundant than O-17. Theoretical stellar evolution suggests that O-18 is being destroyed during the hot-bottom burning. This implies that these OH/IR stars come from a population of intermediate-mass stars which have an initial mass >= 5 M-circle dot.



Denna post skapades 2016-03-30.
CPL Pubid: 233866