2016MNRAS.462.3945A -
Mon. Not. R. Astron. Soc., 462, 3945-3954 (2016/November-2)
Observations of the planetary nebula RWT 152 with OSIRIS/GTC.
ALLER A., MIRANDA L.F., OLGUIN L., SOLANO E. and ULLA A.
Abstract (from CDS):
RWT 152 is one of the few known planetary nebulae with an sdO central star. We present subarcsecond red tunable filter Hα imaging and intermediate-resolution, long-slit spectroscopy of RWT 152 obtained with OSIRIS/GTC (Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy/Gran Telescopio Canarias) with the goal of analysing its properties. The Hα image reveals a bipolar nebula with a bright equatorial region and multiple bubbles in the main lobes. A faint circular halo surrounds the main nebula. The nebular spectra reveal a very low excitation nebula with weak emission lines from H+, He+ and double-ionized metals, and absence of emission lines from neutral and single-ionized metals, except for an extremely faint [N II] λ6584 emission line. These spectra may be explained if RWT 152 is a density-bounded planetary nebula. Low nebular chemical abundances of S, O, Ar, N and Ne are obtained in RWT 152, which, together with the derived high peculiar velocity (∼ 92-131 km s–1), indicate that this object is a halo planetary nebula. The available data are consistent with RWT 152 evolving from a low-mass progenitor (∼1 M☉) formed in a metal-poor environment.
Abstract Copyright:
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Journal keyword(s):
subdwarfs - ISM: abundances - planetary nebulae: individual: RWT 152 - planetary nebulae: individual: RWT 152
Simbad objects:
9
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