Detection of HCO+ Emission toward the Planetary Nebula K 3-35

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dc.creatorTafoya, D.
dc.creatorGomez, Y.
dc.creatorAnglada, G.
dc.creatorLoinard, L.
dc.creatorTorrelles, J. M.
dc.creatorMiranda, L. F.
dc.creatorOsorio, M.
dc.creatorFranco-Hernandez, R.
dc.creatorNyman, L. -A.
dc.creatorNakashima, J.
dc.creatorDeguchi, S.
dc.date2006-10-02
dc.date.accessioned2026-07-07T11:26:07Z
dc.date.available2026-07-07T11:26:07Z
dc.descriptionWe 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_Sun, and an HCO+ abundance relative to H_2 of 6 X 10^-7, similar to the abundances found in other PNe. K~3-35 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 $\simeq$ 5000 AU away from the center. The presence of molecular emission provides some clues that could help to understand the persistence of water molecules in the envelope of K 3-35. The HCO$^{+}$ emission could be arising in dense molecular clumps, that may provide the shielding mechanism which protects water molecules in this source.
dc.description16 pages, 6 figures, accepted in AJ, in press
dc.identifierhttps://arxiv.org/abs/astro-ph/0610048
dc.identifierhttp://arxiv.org/abs/astro-ph/0610048
dc.identifierAstron.J.133:364-369,2007
dc.identifierdoi:10.1086/509776
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195724
dc.subjectAstrophysics
dc.titleDetection of HCO+ Emission toward the Planetary Nebula K 3-35
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