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S.N. Zhang (UAH and NASA/MSFC), X. Sun (BAO/CAS, USRA and NASA/MSFC), W. Cui (MIT), W. Chen (UMd and NASA/GSFC), J. Swank (NASA/GSFC)
The newly discovered soft X-ray transient XTE J2012+381 was monitored with PCA/RXTE during its outburst in 1998. Its energy spectrum can be well fit by a three-component model: a broad iron emission line feature between 6-7 keV, multi-color accretion disk blackbody component, and a power-law. The main result of the spectral analysis is that the inner accretion disk radius inferred from the blackbody component is consistent with being a constant during the decay phase of the outburst, during a flux decrease by a factor of 3-4. This is very similar to other black hole X-ray binaries during their outburst decay, thus may indicate that XTE J2012+381 contains also a stellar mass black hole.