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A plural of corona.
References in periodicals archive ?
15 ASTROPHYSICAL JOURNAL the discovery of an especially large, cool shell around the star R Coronae Borealis.
The R Coronae Borealis shell is 8 parsecs or 26 light-years across, about 20 times as large as any shell previously found around a late-type star such as this.
Currently stars like R Coronae Borealis appear to be losing mass gradually.