The mass function of young spectroscopic binaries and stars with protoplanetary disks

The observational data on 58 pre-main sequence (PMS) double-lined spectroscopic binaries (SB2) and 115 stars with protoplanetary disks are compiled for statistical investigation. These stars are located in different star-forming regions. The constructed distributions of young stars by component masses, taking into account the effects of observational selection (discovery probability and/or occupied volume), are approximated with a power law $dN \sim M^{-\Gamma} d\log{M}$. The slopes are determined on the interval from the maximum of the distributions to the largest mass value and are equal to $\Gamma= 0.92 \pm 0.23$ for the components of SB2 systems and $\Gamma = 1.51 \pm 0.30$ for the stars with disks, respectively, which are close to the Salpeter's mass function. The most probable values of the mass are $M_p= 0.48 \pm 0.02$ $M_{\odot}$ for stars with protoplanetary disks and $M_p= 0.95 \pm 0.05$ $M_{\odot}$ for SB2 components.