Strong absorption linas of the interstellar species Ca+, CH, CH+ and CN have been detected in the spectrum of the O type star HD 154368. There is evidence that these interstellar species lie in gas situated close to the Sun, and also that the molecular species are more localized in space than is the interstellar Ca+.
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- 1 - Physical Sciences ; 2 - Physics and Astronomy ; 3 - Astronomy and Astrophysics