H2O Isotopologues in Extreme OH/IR Stars

Justtanont, Kay,1965Chalmers tekniska högskola,Chalmers University of Technology (author)

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.

Barlow, M. J. (author)
Blommaert, Jadl (author)
Decin, L. (author)
Kerschbaum, F. (author)
Matsuura, M. (author)
Olofsson, Hans,1952Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)hanolo (author)
Swinyard, B. (author)
Teyssier, D. (author)
Waters, Lbfm (author)
Yates, J. A. (author)
Chalmers tekniska högskola (creator_code:org_t)

In: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, 2014497, s. 85-899781583818794

By the author/editor: Justtanont, Kay, ...; Barlow, M. J.; Blommaert, Jadl; Decin, L.; Kerschbaum, F.; Matsuura, M.; show more...; Olofsson, Hans, ...; Swinyard, B.; Teyssier, D.; Waters, Lbfm; Yates, J. A.; show less...

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