Academic Journal
Very Large Telescope deep echelle spectroscopy of Galactic planetary nebulae NGC 6153, M 1-42 and Hf 2-2
| العنوان: | Very Large Telescope deep echelle spectroscopy of Galactic planetary nebulae NGC 6153, M 1-42 and Hf 2-2 |
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| المؤلفون: | McNabb, I. A., Fang, X., Liu, X.W. |
| المساهمون: | Fang, X (reprint author), CSIC, Inst Astrofis Andalucia, Glorieta Astron S-N, E-18008 Granada, Spain., Fang, X (reprint author), Univ Hong Kong, Fac Sci, Lab Space Res, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China., Fang, X (reprint author), Univ Hong Kong, Dept Phys, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China., Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China., CSIC, Inst Astrofis Andalucia, Glorieta Astron S-N, E-18008 Granada, Spain., Univ Hong Kong, Fac Sci, Lab Space Res, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China., Univ Hong Kong, Dept Phys, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China., Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China. |
| المصدر: | SCI |
| بيانات النشر: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
| سنة النشر: | 2016 |
| المجموعة: | Peking University Institutional Repository (PKU IR) / 北京大学机构知识库 |
| مصطلحات موضوعية: | atomic data, atomic processes, line: identification, planetary nebulae: individual: NGC 6153, planetary nebulae: individual: M 1-42, planetary nebulae: individual: Hf 2-2, OPTICAL RECOMBINATION LINES, EFFECTIVE COLLISION STRENGTHS, DISTRIBUTED ELECTRON ENERGIES, SOUTHERN SPECTROPHOTOMETRIC STANDARDS, CASE-B APPROXIMATION, HEAVY ELEMENT LINES, CHEMICAL ABUNDANCES, GASEOUS NEBULAE, TRANSITION-PROBABILITIES, FORBIDDEN TRANSITIONS |
| الوصف: | We present deep spectroscopy of three Galactic planetary nebulae (PNe) with large abundance discrepancy factors: NGC 6153, M 1-42 and Hf 2-2. The spectra were obtained with Very Large Telescope/Ultraviolet and Visual Echelle Spectrograph and cover the whole optical range (3040-11 000 angstrom) with a spectral resolution of similar to 20 000. For all three PNe, several hundred emission lines were detected and identified, with more than 70 per cent of them as permitted lines. Most of these permitted lines are excited by recombination. Numerous weak optical recombination lines (ORLs) of O II, C II, N II and Ne II were detected in the spectra and accurate fluxes measured. Line flux tables were compiled and ready for use by the community of nebular astrophysics. These ORLs were critically analysed using the effective recombination coefficients recently calculated for the optical recombination spectrum of N II and OII under the physical conditions of photoionized gaseous nebulae. Plasma diagnostics based on the heavy element ORLs were carried out using the new atomic data. Elemental abundances derived from the ORLs were systematically higher than those derived from the collisionally excited lines (CELs) by a factor of similar to 11, 22 and 80 for NGC 6153, M 1-42 and Hf 2-2, respectively. The electron temperatures derived from the heavy element ORLs are systematically lower than those derived from the CELs. These ORL versus CEL abundance and temperature discrepancies, previously observed in the three PNe through deep spectroscopy with medium to low spectral resolution, are thus confirmed by our analysis of the deep echelle spectra using the new atomic data. ; Natural Science Foundation of China [10933001] ; SCI(E) ; ARTICLE ; fangx@hku.hk ; 3 ; 2818-2846 ; 461 |
| نوع الوثيقة: | journal/newspaper |
| اللغة: | English |
| تدمد: | 0035-8711 1365-2966 |
| Relation: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY.2016,461(3),2818-2846.; 1512571; http://hdl.handle.net/20.500.11897/456921; WOS:000383481100040 |
| DOI: | 10.1093/mnras/stw1405 |
| الاتاحة: | https://hdl.handle.net/20.500.11897/456921 https://doi.org/10.1093/mnras/stw1405 |
| رقم الانضمام: | edsbas.4B1AF9DC |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 00358711 13652966 |
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| DOI: | 10.1093/mnras/stw1405 |