Extinct 93Zr in Single Presolar SiC Grains from Low Mass Asymptotic Giant Branch Stars and Condensation from Zr-depleted Gas

Details Extinct 93Zr in Single Presolar SiC Grains from Low Mass Asymptotic Giant Branch Stars and Condensation from Zr-depleted Gas Extinct 93Zr in Single Presolar SiC Grains from Low Mass Asymptotic Giant Branch Stars and Condensation from Zr-depleted Gas

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...713..212k&link_type=abstract

The Astrophysical Journal, Volume 713, Issue 1, pp. 212-219 (2010).

Astronomy and Astrophysics

Astronomy

Astrochemistry, Circumstellar Matter, Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Abundances, Stars: Agb And Post-Agb

Scientific paper

Synchrotron X-ray fluorescence was used in this study for the first time to measure trace element abundances in single presolar grains. The abundances of Zr and Nb were determined in SiC grains of the KJF size-separate. These grains are most likely from C-rich asymptotic giant branch stars (mainstream grains). Comparison of the data with s-process calculations suggests that the relatively short-lived isotope 93Zr (t 1/2 = 1.5 × 106 yr) condensed into the grains. The Nb/Zr ratios of the majority of the grains are higher than the s-process and CI chondrite ratios. This is probably due to grains condensing from stellar gas that was depleted in Zr, potentially because of earlier condensation of ZrC, but not depleted in Nb. However, grain contamination with solar system Nb is possible as well. Upper limits on the initial 93Zr/Zr ratios in the grains agree with the ratios observed in late-type S stars.

Affiliated with

Also associated with

No associations

Rating

Extinct 93Zr in Single Presolar SiC Grains from Low Mass Asymptotic Giant Branch Stars and Condensation from Zr-depleted Gas does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Extinct 93Zr in Single Presolar SiC Grains from Low Mass Asymptotic Giant Branch Stars and Condensation from Zr-depleted Gas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extinct 93Zr in Single Presolar SiC Grains from Low Mass Asymptotic Giant Branch Stars and Condensation from Zr-depleted Gas will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1802984