| Autor: |
Montoro-Molina, B, Guerrero, M A, Santamaría, E, Toalá, J A, Chu, Y-H, Ramos-Larios, G, Infante-Sainz, R, Akhlaghi, M, Eskandarlou, S, López-Sanjuan, C |
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| Zdroj: |
Monthly Notices of the Royal Astronomical Society; 8/20/2023, Vol. 523 Issue 4, p1601-1614, 14p |
| Abstrakt: |
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 × |$f_{\mathrm{halo}}^{1/2}$| M⊙ from the ionized inner shell, outer shell, and halo, respectively. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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