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We discuss semi-classical string configurations at finite temperature. Wefind that those soliton solution in the background describing type IIA stringsdisappear or become divergent when we approach the Hagedorn temperature in thestrong coupling regime. These findings together with a semi-classical analysisfor the Hawking radiation let us to think that Hawking radiation is mainlydriven by the existence of highly excited states. As by side, we check thatbeside the thermodynamical instability the system is dynamical unstable beforereaching the Hagedorn temperature.

A note on the string spectrum at the Hagedorn temperature