Detection of C8H- and Comparison with C8H toward IRC +10 216

Details Detection of C8H- and Comparison with C8H toward IRC +10 216 Detection of C8H- and Comparison with C8H toward IRC +10 216

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...664l..47r&link_type=abstract

The Astrophysical Journal, Volume 664, Issue 1, pp. L47-L50.

Astronomy and Astrophysics

Astronomy

44

Line: Identification, Radio Lines: Stars, Stars: Agb And Post-Agb, Stars: Individual (Irc +10 216)

Scientific paper

We report the detection of new transitions of octatetraynyl (C8H) toward the circumstellar envelope IRC +10 216 using data taken with the 100 m Green Bank Telescope (GBT). In addition, we report five features from the Ku, K, and Q bands that have been identified as transitions of the octatetraynyl anion (C8H-). From a rotational temperature diagram and an assumed source size of 30", we find a total C8H column density of 8(3)×1012 cm-2 and a rotational temperature of ~13 K. From the five detected transitions of C8H-, we find a total C8H- column density of ~2.1×1012 cm-2 consistent with a rotational temperature of ~34 K for a total C8H/C8H- column density ratio of ~3.8. This observed C8H/C8H- column density ratio is similar to the theoretical prediction of 3.6, while the observed column densities were lower than that predicted by a factor of ~30. This prompted us to reinvestigate the initial conditions of the circumstellar envelope (CSE) model. The new model results are presented, and they more closely match the C8H and C8H- abundances observed with the GBT. Finally, we use the new CSE model results to predict the abundance of decapentaynyl (C10H), and we compare them with the measured upper limit found from the GBT observations.

Affiliated with

Also associated with

No associations

Rating

Detection of C8H- and Comparison with C8H toward IRC +10 216 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 Detection of C8H- and Comparison with C8H toward IRC +10 216, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detection of C8H- and Comparison with C8H toward IRC +10 216 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1030997