The Mass Accretion Rate and Stellar Properties in Class I Protostars

Abstract Stars collect most of their mass during the protostellar stage, yet accretion luminosity and stellar parameters, which are needed to compute rate, poorly constrained for youngest sources. The aim this work is fill gap, computing properties rates a large sample Class I protostars located in nearby (<500 pc) star-forming regions analyzing interplay. We used self-consistent method provide parameters by modeling spectral energy distribution using veiling information from near-IR observations when possible. calculated first time 50 young stars. focused our analysis on 39 confirmed protostars, finding that rate varies between ∼10 −8 −4 M ⊙ yr −1 range ∼0.1 3 . find systematically larger than II objects. Although we found high, it still suggests either stars before or eruptive overall phase. Indeed, results suggest number disk can be unstable, result bursts fragmentation past future.