Fitting X-ray spectra of RX J0513.9-6951 shows the white dwarf is smaller and less luminous in optically bright states, contradicting the contraction model.
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Examining the evolution of the Supersoft X-ray Source RX J0513.9-6951
Fitting X-ray spectra of RX J0513.9-6951 shows the white dwarf is smaller and less luminous in optically bright states, contradicting the contraction model.