Evidence of Hot-Bottom-Burning in Extreme OH/IR Stars

SPICA Science Conference from Exoplanets to Distant Galaxies: SPICA's New Window on the Cool Universe (June 18-21, 2013. Ito Hall, the University of Tokyo), Bunkyou-ku, Tokyo, Japan
Observations by Herschel Space Observatory of extreme OH/IR stars indicate that these objects currently undergo a phase of very high mass loss - superwind. We derived relatively low 12C/13C ratios which is indicative of the hot-bottom burning process. Further evidence from the observed oxygen isotopes (16O/17O/18O) also support this idea. We conclude that these stars are massive (M greater than or equal to 5 solar mass) AGB stars. With SPICA-SAFARI, it will be possible to observe these isotopic ratios in a number of these stars as they contribute significant gas and dust mass return to the interstellar medium of our galaxy.
形態: カラー図版あり
Physical characteristics: Original contains color illustrations
資料番号: AA1730027049
レポート番号: JAXA-SP-17-010E