5 Conclusions

• The infrared spectrum of the supersoft X-ray source MR Vel has been studied. It contains spectral features consistent with a very luminous accretion disk.

• We find that the optical-infrared energy spectral distribution can be modeled with the supercritical disk model, yielding a distance between 2 and 5 kpc.

• The corresponding absolute magnitude $M_{\rm V}$lies between -2 and 0.

Acknowledgements

We thank the referee C. Motch, for useful comments on a first version of this paper. We also acknowledge J. Fukue who gave some advises in the calculation. This work was supported by Grant Fondecyt 1000324 and DIUC 202.01.030-1.0. MD acknowledges the CNPq support under grant # 301029.