000008032 001__ 8032
000008032 005__ 20260226111341.0
000008032 037__ $$aCTALK-2026-0090
000008032 100__ $$aWesson, R.  
000008032 245__ $$aJWST imaging observations of the Ring Nebula
000008032 260__ $$c2023
000008032 269__ $$c2023-09-04
000008032 500__ $$aPlanetary Nebulae: A Universal Toolbox in the Era of Precision Astrophysics. IAU Symposium, Vol. 384. Proceedings of the International Astronomical Union; O. De Marco, A. Zijlstra, R. Szczerba, editors., Volume 19, pp. 183-189, 7 pp.
000008032 520__ $$aWe present JWST images of NGC 6720 (the Ring Nebula), covering wavelengths from 1.6 μm to 25 μm. The bright shell is strongly fragmented with some 20 000 dense globules, bright in H2, with a characteristic diameter of 0.2 arcsec and density nH∼105–106cm‑3. The shell contains a narrow ring of polycyclic aromatic hydrocarbon (PAH) emission. H2 is found throughout the shell and also in the halo. The central cavity is filled with high ionization gas and shows two linear structures seen in projection against the cavity. The central star is located 2 arcsec from the emission centroid of the cavity and shell. Linear features ('spikes') extend outward from the ring, pointing away from the central star. Around ten low-contrast, regularly spaced concentric arc-like features are present; they suggest orbital modulation by a low-mass companion with a period of about 280 yr. A previously known much wider companion is located at a projected separation of about 15 000 au; we show that it is an M2–M4 dwarf. NGC 6720 is therefore a triple star system. These features, including the multiplicity, are similar to those seen in the Southern Ring Nebula (NGC 3132) and may be a common aspect of such nebulae.
000008032 594__ $$aNO
000008032 6531_ $$astars: planetary nebulae
000008032 6531_ $$aabundances dust
000008032 6531_ $$amolecular abundances
000008032 700__ $$aMatsuura, Mikako  
000008032 700__ $$a Zijlstra, Albert 
000008032 700__ $$a Volk, Kevin 
000008032 700__ $$aKavanagh, Patrick J. 
000008032 700__ $$aGarcía-Segura, Guillermo 
000008032 700__ $$aMcDonald, I.  
000008032 700__ $$a Sahai, Raghvendra 
000008032 700__ $$aBarlow, M. J.  
000008032 700__ $$aCox, Nick L. J. 
000008032 700__ $$aBernard-Salas, Jeronimo 
000008032 700__ $$aAleman, Isabel 
000008032 700__ $$aCami, Jan 
000008032 700__ $$aClark, Nicholas 
000008032 700__ $$aDinerstein, Harriet L.  
000008032 700__ $$aJusttanont, K.  
000008032 700__ $$a Kaplan, Kyle F. 
000008032 700__ $$aManchado, A.  
000008032 700__ $$a Peeters, Els  
000008032 700__ $$aVan de Steene, Griet C. 
000008032 700__ $$a  van Hoof, Peter A. M.  
000008032 773__ $$tPlanetary Nebulae: A Universal Toolbox in the Era of Precision Astrophysics. IAU Symposium, Vol. 384. Proceedings of the International Astronomical Union; O. De Marco, A. Zijlstra, R. Szczerba, editors., Volume 19, pp. 183-189, 7 pp.
000008032 8560_ $$fgriet.vandesteene@ksb-orb.be
000008032 85642 $$ahttps://ui.adsabs.harvard.edu/abs/2025IAUS..384..183W/abstract
000008032 906__ $$aContributed
000008032 980__ $$aCTALKCONT