2007AJ....133..364T -
Astron. J., 133, 364-369 (2007/February-0)
Detection of HCO+ emission toward the planetary nebula K3-35.
TAFOYA D., GOMEZ Y., ANGLADA G., LOINARD L., TORRELLES J.M., MIRANDA L.F., OSORIO M., FRANCO-HERNANDEZ R., NYMAN L.-A., NAKASHIMA J. and DEGUCHI S.
Abstract (from CDS):
We report the detection, for the first time, of HCO+(J=1⟶0) emission, as well as marginal CO(J=1⟶0) emission, toward the planetary nebula (PN) K3-35 as a result of a molecular survey carried out toward this source. We also report new observations of the previously detected CO(J=2⟶1) and water maser emission, as well as upper limits for the emission of the SiO, H13CO+, HNC, HCN, HC3OH, HC5N, CS, HC3N, 13CO, CN, and NH3 molecules. From the ratio of CO(J=2⟶1) to CO(J=1⟶0) emission we have estimated the kinetic temperature of the molecular gas, obtaining a value of ≃20 K. Using this result we have estimated a molecular mass for the envelope of ≃0.017 M☉ and an HCO+ abundance relative to H2 of 6x10–7, similar to the abundances found in other PNe. K3-35 is remarkable because it is one of the two PNe reported to exhibit water maser emission, which is present in the central region, as well as at a distance of ≃5000 AU from the center. The presence of molecular emission provides some clues that could help in understanding the persistence of water molecules in the envelope of K3-35. The HCO+ emission could be arising in dense molecular clumps, which may provide the shielding mechanism that protects water molecules in this source.
Abstract Copyright:
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Journal keyword(s):
Stars: Circumstellar Matter - ISM: Molecules - ISM: Planetary Nebulae: General - Radio Lines: ISM - stars: individual (K3-35)
Simbad objects:
4
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