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Discovery of two ne...
Discovery of two new magnesium-bearing species in IRC+10216: MgC3N and MgC4H
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- Cernicharo, J. (author)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Cabezas, C. (author)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Pardo, J. R. (author)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Agundez, M. (author)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Bermudez, C. (author)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Velilla Prieto, Luis, 1981 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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Tercero, F. (author)
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Lopez Perez, J. (author)
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Gallego, J. D. (author)
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- Fonfria, J. P. (author)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Quintana-Lacaci, G. (author)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Guelin, M. (author)
- Institut de Radioastronomie Millimétrique (IRAM)
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- Endo, Y. (author)
- National Chiao Tung University
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(creator_code:org_t)
- 2019-09-23
- 2019
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 630
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- stars: carbon
- line: identification
- stars: individual: IRC+10216
- circumstellar matter
- astrochemistry
- molecular data
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Cernicharo, J.
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Cabezas, C.
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Pardo, J. R.
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Agundez, M.
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Bermudez, C.
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Velilla Prieto, ...
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show more...
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Tercero, F.
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Lopez Perez, J.
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Gallego, J. D.
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Fonfria, J. P.
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Quintana-Lacaci, ...
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Guelin, M.
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Endo, Y.
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show less...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Astronomy and As ...
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Chalmers University of Technology