DOI: 10.1016/j.jqsrt.2010.10.012
14 citations
Résumé:

Recently, a high temperature source has been used to produce high temperature emission spectra of acetylene in the 3 μm spectral range, under Doppler limited resolution, and the complete spectral assignment has been performed using a global rovibrational Hamiltonian [Amyay B, Robert S, Herman M, Fayt A, Raghavendra B, Moudens A et al. Vibration–rotation pattern in acetylene (II): Introduction to Coriolis coupling in the global model and analysis of emission spectra of hot acetylene around 3 μm. J Chem Phys 2009;131:114301]. The present investigation focuses on the relative emission line intensities which are observed to be affected. The strongest lines intensity may be considerably reduced for high column density acetylene samples, hence affecting the 3:1 ortho:para intensity ratio. A radiative model is developed to take into account the effects generated by the strong opacity of the acetylene samples including self-absorption and absorption of the radiation emitted by the hot environment. The model is used to extract the absolute concentration of the high temperature acetylene samples from the observed relative spectral intensities. The relevance of the procedure for infrared remote sensing in high temperature astrophysical environments, such as circumstellar envelopes of cool carbon rich evolved stars, is discussed.

DOI: 10.1139/p10-122
Résumé:

The abundance of heavy r-elements may provide a better understanding of the r-process, and the determination of several reference r-elements should allow a better determination of a star's age. The space UV region (λ < 3000 Å) presents a large number of lines of the heavy elements, and in the case of some elements, such as Bi, Pt, Au, detectable lines are not available elsewhere. The extreme “r-process star” CS 31082–001 ([Fe/H] = –2.9) was observed in the space UV to determine abundances of the heaviest stable elements, using STIS on board Hubble Space Telescope.

Ref HAL: hal-00653717_v1
DOI: 10.1088/1742-6596/328/1/012005
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15 citations

Ref HAL: hal-00651250_v1
Ref Arxiv: 1101.2207
DOI: 10.1051/0004-6361/201015076
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29 citations
Commentaires: Pages: 11 (+ 6 online material), Figures: 14, Tables: 4 (+ 2 online material)

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Ref Arxiv: 1101.2260
DOI: 10.1088/0004-6256/141/3/102
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18 citations
Commentaires: 16 pages, 8 figures, accepted by AJ

Ref HAL: hal-00651235_v1
Ref Arxiv: 1012.4358
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Commentaires: 10 pages, accepted for publication in A&A

Ref HAL: hal-00651233_v1
Ref Arxiv: 1112.0141
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Commentaires: 14 pages, 6 figures, 6 tables, accepted for publication in Astronomy and Astrophysics