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

ABSTRACT We present a multiwavelength 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 Camera (ALFOSC) spectra images unveil in unprecedented detail high-ionization structure 6905. The high-quality 193949 allowed us to detect more than 20 WR features including characteristic O-bump, blue bump, red which suggests spectral type no later [WO2]-subtype. Moreover we Ne vii viii broad emission lines, rendering yet another CSPN with Teff ? 150 kK exhibiting such stellar lines. studied physical properties (Te ne) chemical abundances different regions within low-ionization clumps; are found be homogeneous. used PoWR atmosphere code model spectrum 193949, is afterwards photoionization performed cloudy that reproduces nebular dust for total mass 0.31–0.47 M? range C-rich ?2 × 10?3 M?. Adopting current 0.6 M?, our an initial ?1 consistent observations.