Spitzer mid-infrared spectroscopic observations of planetary nebulae
| Autor: | Martín A. Guerrero, Jesús A. Toalá, G. Rubio, L. J. Corral, H. Mata, S. N. Kemp, S. G. Navarro, A. Nigoche-Netro, Gerardo Ramos-Larios, Xuan Fang |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Infrared
FOS: Physical sciences Astrophysics Excitation temperature Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Spitzer Space Telescope 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Emission spectrum Spectroscopy 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics Physics 010308 nuclear & particles physics Astronomy Astronomy and Astrophysics Effective temperature Planetary nebula Astrophysics - Astrophysics of Galaxies Stars Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics |
| Popis: | We present Spitzer Space Telescope archival mid-infrared (mid-IR) spectroscopy of a sample of eleven planetary nebulae (PNe). The observations, acquired with the Spitzer Infrared Spectrograph (IRS), cover the spectral range 5.2-14.5 {\mu}m that includes the H2 0-0 S(2) to S(7) rotational emission lines. This wavelength coverage has allowed us to derive the Boltzmann distribution and calculate the H2 rotational excitation temperature (Tex). The derived excitation temperatures have consistent values ~900+/-70 K for different sources despite their different structural components. We also report the detection of mid-IR ionic lines of [Ar III], [S IV], and [Ne II] in most objects, and polycyclic aromatic hydrocarbon (PAH) features in a few cases. The decline of the [Ar III]/[Ne II] line ratio with the stellar effective temperature can be explained either by a true neon enrichment or by high density circumstellar regions of PNe that presumably descend from higher mass progenitor stars. Comment: 14 pages, 15 figures, Accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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