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