A rotating spiral structure in the innermost regions around IRC+10216

11th Pacific Rim Conference on Stellar Astrophysics: Physics and Chemistry of the Late Stages of Stellar Evolution

物理学;天文学

Quintana-Lacaci, G.^1 ; Cernicharo, J.^1 ; Agúndez, M.^1 ; Prieto, L. Velilla^1,2 ; Castro-Carrizo, A.^1 ; Marcelino, N.^4 ; Cabezas, C.^5 ; Peña, I.^5 ; Alonso, J.L.^5 ; Zuñiga, J.^6 ; Requena, A.^6 ; Bastida, A.^6 ; Kalugina, Y.^7,8 ; Lique, F.^7 ; Guélin, M.^3,9

Group of Molecular Astrophysics. ICMM, CSIC, C/ Sor Juana Inés de la Cruz 3, Cantoblanco, Madrid

28049, Spain^1

Centro de Astrobiologìa, INTA-CSIC, Villanueva de la Cañada, Madrid

E-28691, Spain^2

Institut de Radioastronomie Millimétrique, 300 rue de la la Piscine, St.-Martin d'Heères

F-38406, France^3

INAF, Istituto di Radioastronomia, via P. Gobetti 101, Bologna

40129, Italy^4

Grupo de Espectroscopìa Molecular, Edificio Quifima, Laboratorios de Espectroscopìa y Bioespectroscopìa, Unidad Asociada CSIC, Parque Cientìfico Uva, Universidad de Valladolid, Paseo de Belén 5, Valladolid

E-47011, Spain^5

Universidad de Murcia, Faculdad de Quìmica, Dpto. de Quìmica-Fìsica, Campus Espinardo, Murcia

E-30100, Spain^6

LOMC-UMR 6294, CNRS-Université du Havre, 25 rue Philippe Lebon, BP. 1123, Le Havre Cedex

76063, France^7

Department of Optics and Spectroscopy, Tomsk State University, 36 Lenin av., Tomsk

634050, Russia^8

LERMA, Observatoire de Paris, PSL Research University, CNRS, UMR 8112, Paris

F-75014, France^9

关键词: Evolved stars;    Gas distribution;    Metal bearings;    Molecular emissions;    Molecular maps;    Rotational transition;    Spherical shell;    Spiral structures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/728/2/022005/pdf
DOI  :  10.1088/1742-6596/728/2/022005

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

ALMA interferometer is providing us molecular maps with unprecedent precision and sensitivity, Key processes in the ejection of matter and dust from these objects occur in their inner zones. We have obtained sub-arcsecond interferometric maps of rotational transitions of metal-bearing molecules towards the prototypical C-rich evolved star IRC+ 10216. While Al- bearing molecular emission presents a roughly spherical shell, the molecular emission from NaCl and KCl presents an elongation in the inner regions, with a central minimum. The presence of the observed features only in KCl and NaCl might be a direct result of their comparatively high dipole moment with respect to the Al-bearing species. The most plausible interpretation for the spatial distribution of the salts is a spiral with a NaCl mass of 0.08 Mowith an inner radius of 27 AU. The gas kinematics suggests that it is slowly expanding and rotating. Alternative gas distributions which could result in the presence of the elongation are also explored.