Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-26
Astrophys.J. 586 (2003) 344-355
Astronomy and Astrophysics
Astrophysics
27 pages, 9 figures, to appear in ApJ
Scientific paper
10.1086/367637
We used the Effelsberg 100m and IRAM 30m telescopes to observe vibrationally excited cyanoacetylene (HCCCN) in several rotational transitions toward the proto-planetary nebula CRL618. Lines from 9 different vibrationally excited states with energies ranging up to 1600 K above ground were detected. The lines show P Cygni profiles indicating that the HCCCN emission originates from an expanding and accelerating molecular envelope. The HCCCN rotational temperature varies with velocity, peaks at 520 K, 3 km/s blue-shifted from the systemic velocity and decreases with higher blueshift of the gas. The column density of the absorbing HCCCN is 3-6 x 1E17 cm^2. We modeled spectra based on spherical models of the expanding envelope which provide 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.
Menten Karl. M.
Schilke Peter
Thorwirth Sven
Winnewisser Gisbert
Wyrowski Frank
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