[HSB2012] 4379 , the SIMBAD biblio

We present new UBVI_c CCD photometry of the young open clusters Trumpler 14 (Tr 14) and Trumpler 16 (Tr 16) in the η Carina Nebula. We also identify the optical counterpart of Chandra X-ray sources and Two Micron All Sky Survey point sources. The members of the clusters were selected from the proper-motion study, spectral types, reddening characteristics, and X-ray or near-IR excess emission. An abnormal reddening law R_V, cl_= 4.4±0.2 was obtained for the stars in the η Carina Nebula using the 141 early-type stars with high proper-motion membership probability (P_µ{gE} 70%). We determined the distance to each cluster and conclude that Tr 14 and Tr 16 have practically the same distance modulus of V₀- M_V= 12.3±0.2 mag (d = 2.9±0.3 kpc). The slope of the initial mass function was determined to be Γ = -1.3 ±0.1 for Tr 14, Γ = -1.3±0.1 for Tr 16, and Γ = -1.4±0.1 for all members in the observed region for the stars with log m{gE}0.2. We also estimated the age of the clusters to be about 1-3 Myr from the evolutionary stage of evolved stars and low-mass pre-main-sequence stars.