Planetary nebulae with Wolf-Rayet-type central stars - II. Dissecting the compact planetary nebula M 2-31 with GTC MEGARA

DOI: 
10.1093/mnras/stab2531
Publication date: 
24/12/2021
Main author: 
Rechy-García, J. S.
IAA authors: 
Cazzoli, S.;Guerrero, M. A.
Authors: 
Rechy-García, J. S.;Toalá, J. A.;Cazzoli, S.;Guerrero, M. A.;Sabin, L.;Gómez-González, V. M. A.;Ramos-Larios, G.
Journal: 
Monthly Notices of the Royal Astronomical Society
Publication type: 
Article
Volume: 
508
Pages: 
2254
Abstract: 
We present a comprehensive analysis of the compact planetary nebula M 2-31 investigating its spectral properties, spatio-kinematical structure, and chemical composition using Gran Telescopio Canarias (GTC) Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía (MEGARA) integral field spectroscopic observations and Nordic Optical Telescope(NOT) Alhambra Faint Object Spectrograph and Camera (ALFOSC) medium-resolution spectra and narrow-band images. The GTC MEGARA high-dispersion observations have remarkable tomographic capabilities, producing an unprecedented view of the morphology and kinematics of M 2-31 that discloses a fast spectroscopic bipolar outflow along position angles 50<SUP>○</SUP> and 230<SUP>○</SUP>, an extended shell, and a toroidal structure or waist surrounding the central star perpendicularly aligned with the fast outflows. These observations also show that the C II emission is confined in the central region and enclosed by the [N II] emission. This is the first time that the spatial segregation revealed by a two-dimensional map of the C II line implies the presence of multiple plasma components. The deep NOT ALFOSC observations allowed us to detect broad Wolf-Rayet (WR) features from the central star of M 2-31, including previously undetected broad O VI lines that suggest a reclassification as a [WO4]-type star.
Database: 
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2021MNRAS.508.2254R/abstract
ADS Bibcode: 
2021MNRAS.508.2254R
Keywords: 
planetary nebulae: general;planetary nebulae: individual: M 2-31;stars: evolution;stars: winds;outflows;stars: Wolf-Rayet;Astrophysics - Solar and Stellar Astrophysics