Detection of HC_9_N (J=39-38) from CRL 2688. and CRL 618 and of NH_3_(5,4) toward CRL 618.

Details Detection of HC_9_N (J=39-38) from CRL 2688. and CRL 618 and of NH_3_(5,4) toward CRL 618. Detection of HC_9_N (J=39-38) from CRL 2688. and CRL 618 and of NH_3_(5,4) toward CRL 618.

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...312..565t&link_type=abstract

Astronomy and Astrophysics, v.312, p.565-568

Astronomy and Astrophysics

Astrophysics

3

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

Scientific paper

Our previous discovery of the HC_9_N molecule in CRL 2688 via the J=43-42 transition has prompted us to search for other transitions. We report here our detection of the HC_9_N J=39-38 emission from the CRL 2688 and CRL 618 nebulae, using the 100-m Effelsberg telescope. Toward CRL 2688, the line is double peaked like the stronger J=43-42 one. Toward CRL 618, the line is tentatively detected; and a reversal ammonia line, non-metastable transition (5,4), appears in the spectrum. This absorption line is due to the ammonia emission in the west side of the fast wind which is absorbed by the cooler outer HII region emitting the radio continuum. We define the hot clump region extending from -30 to the systemic velocity -21 km/sand which emits non-metastable and metastable lines. Our previously described envelope model of CRL 2688 was applied to both HC_9_N J=39-38 and J=43-42 observed line profiles to derive the HC_9_N abundance and other physical parameters of the envelope.

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