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Título: | Observations of the planetary nebula RWT 152 with OSIRIS/GTC |
Autor: | Aller, A.; Miranda, Luis F. CSIC ORCID; Olguín, Laura; Solano Márquez, Enrique CSIC ORCID CVN; Ulla, A. | Palabras clave: | Subdwarfs ISM: abundances Planetary nebulae: individual: RWT 152 |
Fecha de publicación: | 4-ago-2016 | Editor: | Oxford University Press | Citación: | Monthly Notices of the Royal Astronomical Society 462(4): 3945-3954 (2016) | Resumen: | RWT 152 is one of the few known planetary nebulae with an sdO central star. We present subarcsecond red tunable filterHa 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 Ha 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 [NII] lambda 6584 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 (similar to 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 (similar to 1 M-circle dot) formed in a metal-poor environment. | Descripción: | 10 pages, 6 figures | Versión del editor: | http://dx.doi.org/10.1093/mnras/stw1916 | URI: | http://hdl.handle.net/10261/140218 | DOI: | 10.1093/mnras/stw1916 | ISSN: | 0035-8711 | E-ISSN: | 1365-2966 |
Aparece en las colecciones: | (IAA) Artículos |
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IAA_2016_MNRAS_462_Miranda.pdf | 483,8 kB | Adobe PDF | Visualizar/Abrir |
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