CCD images and long-slit spectroscopy of the ring nebula around θ Mus

We present the first digital CCD images and long-slit spectroscopy of the optical ring nebula around the Wolf-Rayet star θ Mus. The CCD images obtained through narrow-band filters centred at [O III] and Hα show that the nebula has a filamentary structure, similar to supernova remnants, mainly seen i...

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Detalles Bibliográficos
Autores principales:	De Castro, C.G.G., Niemela, V.S.
Formato:	JOUR
Materias:	ISM: bubbles Stars: individual: HD 113904 Stars: Wolf-Rayet
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00358711_v297_n4_p1060_DeCastro
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00358711_v297_n4_p1060_DeCastro
record_format	dspace
spelling	todo:paper_00358711_v297_n4_p1060_DeCastro2023-10-03T14:46:39Z CCD images and long-slit spectroscopy of the ring nebula around θ Mus De Castro, C.G.G. Niemela, V.S. ISM: bubbles Stars: individual: HD 113904 Stars: Wolf-Rayet We present the first digital CCD images and long-slit spectroscopy of the optical ring nebula around the Wolf-Rayet star θ Mus. The CCD images obtained through narrow-band filters centred at [O III] and Hα show that the nebula has a filamentary structure, similar to supernova remnants, mainly seen in [O III]. A spatial detachment between [O III] and Ha images suggests excitation stratification, or multiple rings. An analysis of the physical conditions in the nebula was performed by means of long-slit CCD spectra. The spectral images show that the nebula is of low density and medium excitation. By means of quotients of recombination and collisional spectral line fluxes we determine that the principal excitation mechanism is photoionization. We have determined the electronic temperature and density, and chemical abundances for the oxygen at different sites within the nebula. Nebular chemical abundances are found to be similar to the Galactic ISM, indicating that the nebula is mainly composed of swept up material. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00358711_v297_n4_p1060_DeCastro
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	ISM: bubbles Stars: individual: HD 113904 Stars: Wolf-Rayet
spellingShingle	ISM: bubbles Stars: individual: HD 113904 Stars: Wolf-Rayet De Castro, C.G.G. Niemela, V.S. CCD images and long-slit spectroscopy of the ring nebula around θ Mus
topic_facet	ISM: bubbles Stars: individual: HD 113904 Stars: Wolf-Rayet
description	We present the first digital CCD images and long-slit spectroscopy of the optical ring nebula around the Wolf-Rayet star θ Mus. The CCD images obtained through narrow-band filters centred at [O III] and Hα show that the nebula has a filamentary structure, similar to supernova remnants, mainly seen in [O III]. A spatial detachment between [O III] and Ha images suggests excitation stratification, or multiple rings. An analysis of the physical conditions in the nebula was performed by means of long-slit CCD spectra. The spectral images show that the nebula is of low density and medium excitation. By means of quotients of recombination and collisional spectral line fluxes we determine that the principal excitation mechanism is photoionization. We have determined the electronic temperature and density, and chemical abundances for the oxygen at different sites within the nebula. Nebular chemical abundances are found to be similar to the Galactic ISM, indicating that the nebula is mainly composed of swept up material.
format	JOUR
author	De Castro, C.G.G. Niemela, V.S.
author_facet	De Castro, C.G.G. Niemela, V.S.
author_sort	De Castro, C.G.G.
title	CCD images and long-slit spectroscopy of the ring nebula around θ Mus
title_short	CCD images and long-slit spectroscopy of the ring nebula around θ Mus
title_full	CCD images and long-slit spectroscopy of the ring nebula around θ Mus
title_fullStr	CCD images and long-slit spectroscopy of the ring nebula around θ Mus
title_full_unstemmed	CCD images and long-slit spectroscopy of the ring nebula around θ Mus
title_sort	ccd images and long-slit spectroscopy of the ring nebula around θ mus
url	http://hdl.handle.net/20.500.12110/paper_00358711_v297_n4_p1060_DeCastro
work_keys_str_mv	AT decastrocgg ccdimagesandlongslitspectroscopyoftheringnebulaaroundthmus AT niemelavs ccdimagesandlongslitspectroscopyoftheringnebulaaroundthmus
_version_	1807316129548337152

CCD images and long-slit spectroscopy of the ring nebula around θ Mus

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