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Träfflista för sökning "WFRF:(Cabezas C) srt2:(2015-2019)"

Sökning: WFRF:(Cabezas C) > (2015-2019)

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  • Cernicharo, J., et al. (författare)
  • Discovery of the first Ca-bearing molecule in space: CaNC
  • 2019
  • Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 627
  • Tidskriftsartikel (refereegranskat)abstract
    • 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) x 10(11) cm(-2). 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 congruent to 1/60 and congruent to 1, respectively. We searched for the species CaF, CaCl, CaC, CaCCH, and CaCH3 for which accurate frequency predictions are available. Only upper limits have been obtained for these molecules.
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  • Cernicharo, J., et al. (författare)
  • Discovery of two new magnesium-bearing species in IRC+10216: MgC3N and MgC4H
  • 2019
  • Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 630
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on the detection of two series of harmonically related doublets in IRC +10216. From the observed frequencies, the rotational constant of the first series is B = 1380.888 MHz and that of the second series is B = 1381.512 MHz. The two series correspond to two species with a (2)Sigma electronic ground state. After considering all possible candidates, and based on quantum chemical calculations, the first series is assigned to MgC3N and the second to MgC4H. For the latter species, optical spectroscopy measurements support its identification. Unlike diatomic metal-containing molecules, the line profiles of the two new molecules indicate that they are formed in the outer layers of the envelope, as occurs for MgNC and other polyatomic metal-cyanides. We also confirm the detection of MgCCH that was previously reported from the observation of two doublets. The relative abundance of MgC3N with respect to MgNC is close to one while that of MgC4H relative to MgCCH is about ten. The synthesis of these magnesium cyanides and acetylides in IRC +10216 can be explained in terms of a two-step process initiated by the radiative association of Mg+ with large cyanopolyynes and polyynes followed by the dissociative recombination of the ionic complexes.
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  • Lancelot, J, et al. (författare)
  • Schistosome sirtuins as drug targets
  • 2015
  • Ingår i: Future medicinal chemistry. - 1756-8927. ; 7:6, s. 765-782
  • Tidskriftsartikel (refereegranskat)
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  • Resultat 1-9 av 9

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