NGC 2022, a case study of a multiple-shell planetary nebula
We present a detailed study of the physical properties, history of mass loss, and chemical abundances of the planetary nebula NGC 2022. New imaging observations obtained with the OAJ/JAST80 and NOT/ALFOSC confirm the presence of a faint ∼88 arcsec halo surrounding a double-layered elliptical structu...
| Autores: | , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/356273 |
| Acceso en línea: | http://hdl.handle.net/10261/356273 |
| Access Level: | acceso abierto |
| Palabra clave: | (ISM:) planetary nebulae: general (ISM:) planetary nebulae: individual: (NGC 2022) stars: evolution |
| Sumario: | We present a detailed study of the physical properties, history of mass loss, and chemical abundances of the planetary nebula NGC 2022. New imaging observations obtained with the OAJ/JAST80 and NOT/ALFOSC confirm the presence of a faint ∼88 arcsec halo surrounding a double-layered elliptical structure that consists of a bright 21.4 × 16.7 arcsec inner shell and a 32 arcsec diameter envelope. The long-slit high-dispersion echelle observations obtained with MES on the OAN-SPM 2.1-m telescope can be well described by a shape model with expansion velocities of 43 ± 3 and 34 ± 3 km s-1 along the major and minor axes of the elliptical inner shell, respectively. In addition, a deep long-slit high-dispersion echelle observation made with the KPNO 4-m telescope detected line-splitting in the faint halo, revealing an expansion velocity of 15.5 ± 2 km s-1. We have also used new intermediate-dispersion optical spectra with the NOT, complemented with IUE data, to study the chemical abundances of each shell. The abundances of the three shells are typical of a Type II in the Peimbert classification of PNe and do not exhibit any notable anomalies. Finally, we estimate the total mass of NGC 2022 to be ≈0.9 M⊙>, which consists of 0.64 M⊙> from the CSPN and 0.1, 0.11, and 0.1 × M⊙> from the ionized inner shell, outer shell, and halo, respectively. © 2023 The Author(s).Published by Oxford University Press on behalf of Royal Astronomical Society |
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