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| Paper: |
H2O Isotopologues in Extreme OH/IR Stars |
| Volume: |
497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time |
| Page: |
85 |
| Authors: |
Justtanont, K.; Barlow, M. J.; Blommaert, J. A. D. L.; Decin, L.; Kerschbaum, F.; Matsuura, M.; Olofsson, H.; Swinyard, B.; Teyssier, D.; Waters, L. B. F. M.; Yates, J. |
| Abstract: |
Using Herschel Space Observatory, we observed isotopologues of H2O
in extreme OH/IR stars. We detected strong H216O and H217O
while the H218O lines are missing, contrary to the overall galactic
oxygen abundance in the interstellar medium and the Sun, where 18O
is more abundant than 17O. Theoretical stellar evolution suggests
that 18O 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☉. |
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