Morphological study of the nested planetary nebula Hubble 12
| Autor: | Jian-Feng Chen, Hui-Jie Han, Wayne Chau, Yong Zhang, Chih-Hao Hsia, SeyedAbdolreza Sadjadi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Nebula Infrared FOS: Physical sciences Astronomy and Astrophysics Imaging study Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Planetary nebula Astrophysics - Astrophysics of Galaxies law.invention Protein filament Telescope Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science law Hubble space telescope Astrophysics of Galaxies (astro-ph.GA) Spectral energy distribution Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics |
| Popis: | We present a visible-infrared imaging study of young planetary nebula (PN) Hubble 12 (Hb 12; PN G111.8-02.8) obtained with Hubble Space Telescope (HST) archival data and our own Canada-France-Hawaii Telescope (CFHT) measurements. Deep HST and CFHT observations of this nebula reveal three pairs of bipolar structures and an arc-shaped filament near the western waist of Hb 12. The existence of nested bipolar lobes together with the presence of H2 knots suggests that these structures originated from several mass-ejection events during the pre-PN phase. To understand the intrinsic structures of Hb 12, a three-dimensional model enabling the visualisation of this PN at various orientations was constructed. The modelling results show that Hb 12 may resemble other nested hourglass nebulae, such as Hen 2-320 and M 2-9, suggesting that this type of PN may be common and the morphologies of PNs are not so diverse as is shown by their visual appearances. The infrared spectra show that this PN has a mixed chemistry. We discuss the possible material that may cause the unidentified infrared emissions. The analyses of the infrared spectra and the spectral energy distribution suggest the existence of a cool companion in the nucleus of this object. Astronomy & Astrophysics (in press), 14 pages, 9 figures |
| Databáze: | OpenAIRE |
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