Spitzer Space Telescope mid-infrared spectroscopy has been obtained for 15 carbon-rich protoplanetary nebulae (PPNe) in the Large Magellanic Cloud (LMC) and for two other such stars in the Small Magellanic Cloud (SMC). Of these 17 PPNe, the unidentified 21 ѕ®m feature is strong in 7 spectra, weak in 2 spectra, and very weak or questionable in 4 spectra. ... The remaining two objects show typical carbon-rich PPNe spectra with no 21 ѕ®m features. ...
Our Once and Future Homes Life in the Solar System and Beyond Barrie W. Jones Praxis/Springer-Verlag, New York, 2004. $39.95 paper (317 pp.) ... Life in the Solar System and Beyond by Barrie Jones is not a work of popular science written by a journalist with a trendy interest in a hot topic. ... In this respect, Life in the Solar System and Beyond reminded me of Frank Shu's classic astronomy textbook The Physical Universe: An Introduction to Astronomy (University Science Books, 1982). ...
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Ссылки http://www.mso.anu.edu.au/~charley/papers/JonesReviewPhysicsTodayv2.pdf -- 75.3 Кб -- 25.01.2010 Похожие документы
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