Titlebook: Astrophysics and Space Science; Volume 255, 1997/199 John Dyson,Susan A. Lamb,P. A. Zaal Book 1998 Springer Science+Business Media New York

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Flash lite mobile entertainment basicslieve that we understand the phases a dense interstellar cloud passes through in the process of becoming a young star, and we have observational examples of most of those phases. ISO will play a major role in testing this preliminary understanding of star formation, and in suggesting where it needs to be modified.

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Flash lite mobile entertainment basicsellar ice analogs shows that the 7.24 μm band can be well matched by solid formic acid (HCOOH), while the 7.40 μm band can be fitted both by the formate ion (HCOO.) and acetaldehyde (CH.HCO). The laboratory spectra reveal additional strong features of these molecules which should make a more definite identification straightforward.

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Protostars and Protoplanetary Diskslieve that we understand the phases a dense interstellar cloud passes through in the process of becoming a young star, and we have observational examples of most of those phases. ISO will play a major role in testing this preliminary understanding of star formation, and in suggesting where it needs to be modified.

Vertical

ISO-SWS Observations of Weak Bands of Trace Components of Ices Towards the Young Stellar Object W 33ellar ice analogs shows that the 7.24 μm band can be well matched by solid formic acid (HCOOH), while the 7.40 μm band can be fitted both by the formate ion (HCOO.) and acetaldehyde (CH.HCO). The laboratory spectra reveal additional strong features of these molecules which should make a more definite identification straightforward.

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Evolution of Southern Star-Forming Regionshe most evolved objects are coincident with ultracompact HII regions and show strong emission lines from atomic species and polycyclic aromatic hydrocarbons (PAHs). We discuss the ISO spectra between 2.5–200 .m of selected southern star-forming regions in the context of their evolution.