Volume 531, July 2011
|Number of page(s)||3|
|Section||Interstellar and circumstellar matter|
|Published online||15 June 2011|
Unusually high rotational temperature of the CN radical⋆
Center for Astronomy, Nicholas Copernicus University, Gagarina 11, 87-100 Toruń, Poland
2 Instituto de Astronomia, Universidad Catolica del Norte, Av. Angamos 0610, Antofagasta, Chile
3 European Southern Observatory, Casilla 19001, Santiago 19, Chile
Received: 9 December 2010
Accepted: 15 May 2011
We analyse a high-resolution, high signal-to-noise spectrogram of the hot reddened star Trumpler 16 112 to find relationships between the physical parameters of the intervening interstellar medium (e.g., the rotational temperature of the CN radical) and the intensities of interstellar lines/bands. We report on the discovery of an interstellar cloud that shows an exceptionally high rotational temperature of CN (4.5 K) and unusually strong Ca I and Fe I interstellar lines. This rare CaFe-type cloud seemingly contains no diffuse band carriers.
Key words: ISM: lines and bands / ISM: molecules
© ESO, 2011
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