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| molecules:ism:cac2 [2024/05/16 15:31] – created mueller | molecules:ism:cac2 [2024/05/16 16:00] (current) – mueller |
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| Calciumcyclopropynylidene, CaC<sub>2</sub>, is a homolog of MgC<sub>2</sub> and somewhat related to silacyclopropynylidene, SiC<sub>2</sub>.\\ | Calciumcyclopropynylidene, CaC<sub>2</sub>, is a homolog of MgC<sub>2</sub> and somewhat related to silacyclopropynylidene, SiC<sub>2</sub>.\\ |
| P. B. Changala, H. Gupta, J. Cernicharo, J. R. Pardo, M. Agúndez, C. Cabezas, B. Tercero, M. Guélin, and M. C. McCarthy\\ | H. Gupta, P. B. Changala, J. Cernicharo, J. R. Pardo, M. Agúndez, C. Cabezas, B. Tercero, M. Guélin, and M. C. McCarthy\\ |
| reported on the\\ | reported on the\\ |
| **[[https://doi.org/10.3847/2041-8213/aca144|Laboratory and Astronomical Discovery of Magnesium Dicarbide, MgC<sub>2</sub>]]**\\ | **[[https://doi.org/10.3847/2041-8213/ad3336|Calcium Chemistry in Carbon-rich Circumstellar Environments: The Laboratory and Astronomical Discovery of Calcium Dicarbide, CaC<sub>2</sub>]]**\\ |
| //Astrophys. J. Lett// **940**, Art. No. L42 (2022).\\ | //Astrophys. J. Lett// **966**, Art. No. L28 (2024).\\ |
| Ten //a//-type lines with 1 ≤ //J// ≤ 7 and //K<sub>a</sub>// ≤ 4 between 41 and 150 GHz were identified for the main <sup>24</sup>Mg isotopolog employing the Yebes 40 m and IRAM 30 m dishes in the couses of molecular line surveys of CW Leonis. These lines have good to reasonable signal-to-noise ratios, and several lines are unblended. One and three lines were identified for the <sup>25</sup>Mg and <sup>26</sup>Mg minor isotopologs, respectively. The isotopic ratios are compatible with solar values within uncertainties. The derived MgC<sub>2</sub> : MgC<sub>2</sub>H : MgC<sub>4</sub>H : MgC<sub>6</sub>H abundance raios are about 1 : 2 : 22 : 20.\\ | 14 //a//-type lines with 0 ≤ //J// ≤ 8 and //K<sub>a</sub>// ≤ 4 between 14 and 115 GHz were identified for the main <sup>40</sup>Ca isotopolog employing the GBT 100 m, Yebes 40 m, and IRAM 30 m dishes. The observations with the GBT were dedicated ones, the other results were obtained in the couses of molecular line surveys of CW Leonis. These lines have good to reasonable signal-to-noise ratios, and several lines are unblended. Transitions of minor isotopologs were not identified. The derived column density ratio of MgC<sub>2</sub>/CaC<sub>2</sub> is roughly 2.\\ |
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