Planetary nebulae with Wolf-Rayet-type central stars - III. A detailed view of NGC 6905 and its central star

DOI: 
10.1093/mnras/stab3042
Publication date: 
01/01/2022
Main author: 
Gómez-González V.M.A.
IAA authors: 
Guerrero, M. A.
Authors: 
Gómez-González, V. M.A.;Rubio, G.;Toalá, J. A.;Guerrero, M. A.;Sabin, L.;Todt, H.;Gómez-Llanos, V.;Ramos-Larios, G.;Mayya, Y. D.
Journal: 
Monthly Notices of the Royal Astronomical Society
Publication type: 
Article
Volume: 
509.0
Pages: 
974-989
Abstract: 
We present a ltiwavelength characterization of the planetary nebula (PN) NGC 6905 and its [Wolf-Rayet]-type ([WR]) central star (CSPN) HD 193949. Our Nordic Optical Telescope Alhambra Faint Object Spectrograph and Camera (ALFOSC) spectra and images unveil in unprecedented detail the high-ionization structure of NGC 6905. The high-quality spectra of HD 193949 allowed us to detect more than 20 WR features including the characteristic O-bump, blue bump, and red bump, which suggests a spectral type no later than a [WO2]-subtype. Moreover we detect the Ne vii and Ne viii broad emission lines, rendering HD 193949 yet another CSPN with Teff 150 kK exhibiting such stellar emission lines. We studied the physical properties (Te and ne) and chemical abundances of different regions within NGC 6905 including its low-ionization clumps; abundances are found to be homogeneous. We used the PoWR stellar atmosphere code to model the spectrum of HD 193949, which is afterwards used in a photoionization model perfoed with cloudy that reproduces the nebular and dust properties for a total mass in the 0.31-0.47 M range and a mass of C-rich dust of 2 × 10-3 M. Adopting a current stellar mass of 0.6 M, our model suggests an initial mass 1 M for HD 193949, consistent with the observations.
Database: 
SCOPUS
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2022MNRAS.509..974G/abstract
ADS Bibcode: 
2022MNRAS.509..974G
Keywords: 
(ISM:) planetary nebulae | (ISM:) planetary nebulae | evolution | general | HD 193949 | individual | individual | NGC 6905 | outflows | stars | stars | stars | stars | winds | Wolf-Rayet