OT1_smilam_1: Measurements of the Atomic Carbon Isotope Ratio in Evolved Stars
Abstract
We propose to use Herschel-HIFI to observe the atomic carbon isotope ratios of evolved stars. The sample of circumstellar envelopes to be studied are being observed by the HIFISTARS program, where the oxygen isotope ratios will be measured via H2O. The proposed observations will allow us to determine the carbon isotope ratio in various types of stars (C-rich, O-rich, and S-type) as well as constrain chemical fractionation that may occur in the outer envelopes of these objects and/or provide insight into other nucleosythetic processes that may alter the CNO-isotopic abundances. The data in this program are complimentary and will employ the results obtained from the HIFISTARS program.
- Publication:
-
Herschel Space Observatory Proposal
- Pub Date:
- July 2010
- Bibcode:
- 2010hers.prop.1328M