SIMBAD references

2003ApJ...586..338T - Astrophys. J., 586, 338-343 (2003/March-3)

Detection of HCN direct l-type transitions probing hot molecular gas in the proto-planetary nebula CRL 618.

THORWIRTH S., WYROWSKI F., SCHILKE P., MENTEN K.M., BRUENKEN S., MULLER H.S.P. and WINNEWISSER G.

Abstract (from CDS):

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 ΔJ=0 transitions of HCN in its first excited bending mode v2=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 the systemic velocity of CRL 618, indicating that the lines originate from a hot, expanding circumstellar envelope. The HCN column density along the line of sight in front of the continuum is 2x1018 cm–2.

Abstract Copyright:

Journal keyword(s): Line: Identification - Radiation Mechanisms: Nonthermal - Radio Lines: Stars - Stars: AGB and Post-AGB - Stars: Individual: Alphanumeric: CRL 618 - Stars: Mass Loss

Simbad objects: 11

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2019.12.11-10:07:10

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