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OpenStudio's calculation engine is EnergyPlus.

For opaque materials, go over the wavelength differences explained in the EnergyPlus IO Reference:

• material thermal absorptance
• material solar absorptance
• material visible absorptance

For instance, on solar absorptance:

[...] Solar radiation (0.3 to 2.537 μm) includes the visible spectrum as well as infrared and ultraviolet wavelengths.

On thermal absorptance vs emittance/emissivity:

For long wavelength radiant exchange, thermal emissivity and thermal emittance are equal to thermal absorptance.