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The Zanstra method is a method of determining the temperature of a hot star within a nebula such as a planetary nebula. It models the nebula as optically thick for ionizing radiation, and presumes the observed H-β is related to the amount of absorbed ionizing radiation. A comparison of this to the specific intensity of another wavelength yields the fraction of electromagnetic radiation constituting ionizing radiation, from which a matching black-body spectrum can be worked out. A star's Zanstra temperature is its temperature as determined by this method.