The critical temperature to initiate the proton-proton cycle in the cores of stars is:

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The proton-proton cycle requires a temperature of at least 10 million K to initiate in the cores of stars. This is the temperature required for the fusion of protons to form helium nuclei to occur. The proton-proton cycle is the fusion process that powers the Sun and other low-mass stars. The critical temperature required for this process to occur is about 10 million K, which is the temperature at the core of the Sun. This is the minimum temperature required for the protons in the core to have sufficient energy to overcome their mutual electrostatic repulsion and fuse together to form helium.

The Critical Temperature to Initiate the Proton-Proton Cycle in the Cores