Lambda Cyg

Sunday 6 July 2008 by desnova

Lambda Cyg (54 Cyg) exhibits H-alpha evolution.

In the BeSS database, the H-alpha line was in pure absorption in 1992 and more recently in Sept 2007. But the recent spectrum of Christian Buil taken the 18th of June 2008 clearly shows the beginning of an emission phase.

Lambda Cyg evolution

It is thus strongly recommended to observe this star as it can evolve over time quite rapidly.

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