Examinando por Autor "Miranda, L. F."

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The morpho-kinematical structure and chemical abundances of the complex planetary nebula NGC 1514
(Oxford Academics: Oxford University Press, 2021-04-30) Aller, A.; Vázquez, R.; Olguín, L.; Miranda, L. F.; Ressler, M. E.; Comunidad de Madrid; Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT); Centros de Excelencia Severo Ochoa, INSTITUTO DE ASTROFISICA DE ANDALUCIA (IAA), SEV-2017-0709; Unidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737
We present high-resolution, long-slit optical spectra and images of the planetary nebula NGC 1514. The position velocity maps of the [O III] emission line reveal complex kinematics with multiple structures. A morpho-kinematical analysis suggests an inner shell, originally spherical and now distorted by several bubbles, and an attached outer shell. The two well-defined, mid-infrared rings of NGC 1514 are not detected in our high-resolution, long-slit spectra, which prevented us from doing a kinematical analysis of them. Based exclusively on their morphology, we propose a barrel-like structure to explain the rings. Several ejection processes have been possibly involved in the formation of the nebula, although a time sequence is difficult to establish with the current data. We also analyse intermediate-resolution, long-slit spectra with the goal of studying the physical parameters and chemical abundances of NGC 1514. The nebular spectra reveal a moderate-excitation nebula with weak emission lines of [Ar III], [Ne III], He I, and He II. Neither [N II] nor other low-excitation emission lines are detected. We found an electron temperature around 14 000 K in the gas and an electron density in the range of 2000–4000 cm−3.