The First Type-Y Star?

Contributed by: Huang Yunle
The spectral types of stars run from blue (hot) to red (cold): O B A F G K M. The discovery of brown dwarfs in the year 1995 extended the red ends with two newer cooler spectral types: L and T. The discovery of the CFBDS 0059 further extends the red ends to an even cooler spectral type: Y. It is the first sub-red brown dwarf that is cool enough to show ammonia in its spectrum. Read this article to learn more the spectral types of stars and the new discovery: CFBDS 0095.


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