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We present a calculation of the \beta-term for D^* --> D gamma within aheavy-light chiral quark model. Within the model, soft gluon effects in termsof the gluon condensate with lowest dimension are included. Also, calculationsof 1/m_c corrections are performed. We find that the value of \beta is rathersensitive to the constituent quark mass compared to other quantities calculatedwithin the same model. Also, to obtain a value close to the experimental value,one has to choose a constituent light quark mass larger than for otherquantities studied in previous papers. For a light quark mass in the range 250to 300 MeV and a quark condensate in the range -(250-270 MeV)^3 we find thevalue (2.5 +- 0.6) GeV^-1. This value is in agreement with the value of \betaextracted from experiment 2.7 +- 0.2 GeV^-1.Comment: 16 pages, 5 figure

The β-term for D* → D γ within a heavy-light chiral quark model