The super-soft source XMMU J052016.0-692505 in the LMC
作者： P. Kahabka , F. Haberl , J. L. Payne , M. D. Filipović
DOI: 10.1051/0004-6361:20065490
关键词:
摘要: Aims: We report the discovery of super-soft X-ray source XMMU J052016.0-692505 in LMC with XMM-Newton. Methods: We analyse EPIC spectra and study likely optical counterpart LMCV2135. Results: Using an absorbed blackbody spectrum we derive a bolometric luminosity ⪆ 1034 erg s-1 for at distance. Assuming that does not exceed Eddington ~ 1.0 Mȯ star temperature (25-70) eV absorbing column density < 6× 1021 cm-2. The is variable LMCV2135 which MACHO OGLE variable. infrared colors magnitudes this are consistent hot spectral type B. long-term light curve shows variability timescale ˜ 500 1000 days. obtained 1.9-meter telescope South African Astronomical Observatory show strong Hα Hβ emission lines (with EWH_α˜ 34 A) indicate B0-3e star. radial velocities variation from 400-450 km to 5-20 systemic velocity intrinsic most due rotation Be disk. We discuss LMCV2135/XMMU as Be/white dwarf binary system LMC. could be stable nuclear burning white mass 0.9-1.0 Mȯ.
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