H2O Isotopologues in Extreme OH/IR Stars
Paper i 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.
Författare
Kay Justtanont
Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik
M. J. Barlow
Jadl Blommaert
L. Decin
F. Kerschbaum
M. Matsuura
Hans Olofsson
Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik
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)
Ämneskategorier
Astronomi, astrofysik och kosmologi
ISBN
978-1-58381-879-4