HC9N from the Envelopes of IRC+10216 and CRL:2688

Details HC9N from the Envelopes of IRC+10216 and CRL:2688 HC9N from the Envelopes of IRC+10216 and CRL:2688

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...277..133t&link_type=abstract

Astronomy and Astrophysics, Vol. 277, NO. 1/SEP(III), P. 133, 1993

Astronomy and Astrophysics

Astrophysics

11

Stars: Atmospheres - Stars: Fundamental Parameters - Stars: Circumstellar Matter - Radio Lines: Stars - Molecular Data - Radiative Transfer

Scientific paper

We report the detection of the highly-excited HC9N J = 43-42 emission from the circumstellar envelopes of IRC+t02t6 and CRL2688, using the 100-m Effelsberg telescope. This is the first detection of the HC9N molecule in CRL2688.
For IRC+ 102 t 6, our results together with lower- J transition data from Bell et al. (1992) are used to constrain the source size, the excitation temperature, and the column density. It turns out that the diameter of the HC9N envelope should be significantly larger than the value (50") assumed by Bell et al.. Using a spherical LTE envelope model, we derive a HC9N abundance by using the derived excitation temperature and main-beam brightness temperature. An unidentified line at rest frequency νU˜24991.3 MHz has been detected in this object.
For CRL2688, we develop a model of the molecular envelope, accounting for anisotropy of the slow and fast winds and the inclination of the equatorial plane. The calculated line profile is compared to the observations to derive the HC9N abundance.
The cyanopolyyne abundances obtained from observations and from chemical models are compared and discussed.

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