Cernicharo J, Velilla-Prieto L, Agúndez M, Pardo J R, Fonfría J P, Quintana-Lacaci G, Cabezas C, Bermúdez C, Guélin M
Grupo de Astrofísica Molecular. Instituto de Física Fundamental (IFF-CSIC). C/Serrano 121, 28006 Madrid, Spain.
Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 439 92 Onsala, Sweden.
Astron Astrophys. 2019 Jul 1;627. doi: 10.1051/0004-6361/201936040. Epub 2019 Jul 3.
We report on the detection of calcium isocyanide, CaNC, in the carbon-rich evolved star IRC+10216. We derived a column density for this species of (2±0.5)×10 cm. Based on the observed line profiles and the modelling of its emission through the envelope, the molecule has to be produced in the intermediate and outer layers of the circumstellar envelope where other metal-isocyanides have previously been found in this source. The abundance ratio of CaNC relative to MgNC and FeCN is ≃1/60 and ≃1, respectively. We searched for the species CaF, CaCl, CaC, CaCCH, and CaCH for which accurate frequency predictions are available. Only upper limits have been obtained for these molecules.
我们报告了在富含碳的演化恒星IRC+10216中检测到异氰化钙（CaNC）。我们得出该物种的柱密度为(2±0.5)×10厘米。基于观测到的谱线轮廓及其通过包层的发射建模，该分子必须在星际包层的中间层和外层产生，此前在该源中已发现其他金属异氰化物。CaNC相对于MgNC和FeCN的丰度比分别约为1/60和约1。我们搜索了有准确频率预测的CaF、CaCl、CaC、CaCCH和CaCH物种。对于这些分子，仅获得了上限。
