H2O Isotopologues in Extreme OH/IR Stars
Paper in proceeding, 2015
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.
Author
Kay Justtanont
Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics
M. J. Barlow
Jadl Blommaert
L. Decin
F. Kerschbaum
M. Matsuura
Hans Olofsson
Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics
B. Swinyard
D. Teyssier
Lbfm Waters
J. A. 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 85-89
978-1-58381-879-4 (ISBN)
Subject Categories
Astronomy, Astrophysics and Cosmology
ISBN
978-1-58381-879-4