A C-Band Spectral Scan of IRC +10°216

Details A C-Band Spectral Scan of IRC +10°216 A C-Band Spectral Scan of IRC +10°216

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...596..556a&link_type=abstract

The Astrophysical Journal, Volume 596, Issue 1, pp. 556-560.

Astronomy and Astrophysics

Astronomy

4

Stars: Circumstellar Matter, Radio Lines: Stars, Stars: Carbon, Stars: Individual: Alphanumeric: Irc +10216, Telescopes

Scientific paper

We report the results of the presently lowest frequency spectral line survey of the asymptotic giant branch carbon star IRC +10°216. The entire Arecibo C band (4-6 GHz) was observed with a noise level of ~0.3 mJy (1 σ). We report the detection of HC5N (J=2-1), which is the lowest frequency transition of the HC5N molecule found in the envelope of IRC +10°216. The HC5N J=2 column density derived from our observations confirms the presence of two temperature components in the molecular envelope of IRC +10°216. The HC5N J=2-1 transition traces the cold molecular component characterized by an excitation temperature of ~13.8 K. We derive upper limits for several transitions of molecules that had previously been detected in IRC +10°216 at higher frequencies. We also report the frequency ranges in the Arecibo C band that were affected by radio frequency interference.

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