Physical conditions in the proto-planetary nebula CRL 618 derived from observations of vibrationally excited HC3N
F Wyrowski, P Schilke, S Thorwirth…�- The Astrophysical�…, 2003 - iopscience.iop.org
We used the Effelsberg 100 m and IRAM 30 m telescopes to observe vibrationally excited
cyanoacetylene (HC 3 N) 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 HC
3 N emission originates from an expanding and accelerating molecular envelope. The HC 3
N rotational temperature varies with velocity, peaks at 520 K, 3 km s-1 blueshifted from the�…
cyanoacetylene (HC 3 N) 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 HC
3 N emission originates from an expanding and accelerating molecular envelope. The HC 3
N rotational temperature varies with velocity, peaks at 520 K, 3 km s-1 blueshifted from the�…
Detection of HCN direct L-type transitions probing hot molecular gas in the proto-planetary nebula CRL 618
S Thorwirth, F Wyrowski, P Schilke…�- The Astrophysical�…, 2003 - iopscience.iop.org
We report the detection of direct l-type transitions toward the proto–planetary nebula CRL
618 during a study of vibrationally excited carbon chains. The J= 8, 10, 11, 12, 13, and 14 Δ
J= 0 transitions of HCN in its first excited bending mode v 2= 1 were detected in absorption
against the continuum of the central H II region, making use of the Effelsberg 100 m
telescope and the Very Large Array. In addition, the J= 9 direct l-type transition was detected
in emission, presumably indicating a weak maser. All lines are blueshifted with respect to�…
618 during a study of vibrationally excited carbon chains. The J= 8, 10, 11, 12, 13, and 14 Δ
J= 0 transitions of HCN in its first excited bending mode v 2= 1 were detected in absorption
against the continuum of the central H II region, making use of the Effelsberg 100 m
telescope and the Very Large Array. In addition, the J= 9 direct l-type transition was detected
in emission, presumably indicating a weak maser. All lines are blueshifted with respect to�…