GRO J0422+32: The Lowest Mass Black Hole?*

  title={GRO J0422+32: The Lowest Mass Black Hole?*},
  author={Dawn M. Gelino and Thomas E. Harrison},
  journal={The Astrophysical Journal},
We have obtained optical and infrared photometry of the soft X-ray transient GRO J0422+32. From this photometry, we find a secondary star spectral type of M1, and an extinction of AV = 0.74 ± 0.09. We present the first observed infrared (J-, H-, and K-band) ellipsoidal variations, and model them with WD98, a recent version of the Wilson-Devinney light curve-modeling code. Assuming no significant contamination of the infrared light curves, we find a lower limit to the inclination angle of 43… 

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