SIMBAD references

2003ApJ...586..344W - Astrophys. J., 586, 344-355 (2003/March-3)

Physical conditions in the proto-planetary nebula CRL 618 derived from observations of vibrationally excited HC3N.


Abstract (from CDS):

We used the Effelsberg 100 m and IRAM 30 m telescopes to observe vibrationally excited cyanoacetylene (HC3N) in several rotational transitions toward the proto-planetary nebula CRL 618. Lines from nine different vibrationally excited states, with energies ranging up to 1600 K above ground, were detected. The lines show P Cygni profiles indicating that the HC3N emission originates from an expanding and accelerating molecular envelope. The HC3N rotational temperature varies with velocity, peaks at 520 K, 3 km/s blueshifted from the systemic velocity, and decreases with higher blueshift of the gas. The column density of the absorbing HC3N is (3-6)x1017 cm–2. We modeled spectra based on spherical models of the expanding envelope that provided an excellent fit to the observations and discuss the implications of the models. Additionally, lines from 13C substituted cyanoacetylene were observed. They can be used to constrain the 12C/13C ratio in this source to 10±2.

Abstract Copyright:

Journal keyword(s): Stars: Circumstellar Matter - Line: Profiles - Radio Lines: Stars - Stars: AGB and Post-AGB - Stars: Individual: Alphanumeric: CRL 618 - Stars: Mass Loss

Simbad objects: 6

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