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We present J-, H-, and K-band images and low-resolution K-band spectra of the 20 most luminous starburst galaxies from the survey of Condon, Frayer, an average extinction of AV_~ 25 is derived. Strong CO absorption features indicate that late-type evolved stars are present in many of the starbursts. The average dynamical mass of the starburst region is found to be (1. 0 +/- 0. 4) x 10⁹^ Mₛun_.
Smith et al. (Sat,) studied this question.