Detailed studies of IPHAS sources – I. The disrupted late bipolar IPHASX J193718.6+202102. Issue 3 (27th October 2020)

• Record Type: Journal Article
• Authors: Sabin, L; Guerrero, M A; Zavala, S; Toalá, J A; Ramos-Larios, G; Gómez-Llanos, V
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 501:Issue 3(2021)
• Page Start: 3582
• Page End: 3593
• Publication Date: 2020-10-27
• Subjects: ISM: abundances -- ISM: kinematics and dynamics -- planetary nebulae: individual: IPHASX J193718.6+202102; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/staa3270
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We present a detailed analysis of the new planetary nebula (PN) IPHASX J193718.6+202102 using deep imaging and intermediate- and high-resolution spectroscopy that are interpreted through morpho-kinematic and photoionization modelling. The physical structure of the nebula consists of a fragmented torus and an extremely faint orthogonal bipolar outflow, contrary to the pinched waist PN morphology suggested by its optical image. Our kinematic analysis indicates that the torus is expanding at 25 ± 5 km s −1 and is gradually breaking up. At an estimated distance of 7.1$_{-0.3}^{+0.8}$ kpc, the corresponding kinematic age of ∼26 000 yr is consistent with a faint and disintegrating PN. The intermediate-resolution spectra reveal an excited PN with chemical abundances typical of Type II PNe. Based on the latter, we also estimate an initial mass for the progenitor in the range 2–3 M⊙ and a central star (CSPN) mass M CSPN ∼0.61 M⊙ . The Spitzer MIPS 24 μ m emission that closely follows the fragmented torus could be attributed to the emission of [O iv ] at 25.9 μ m rather than to dust emission. All the results coherently point towards an evolved moderately massive bipolar Type II PN on the brink of dissolving into the interstellar medium.