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In this letter we present the first systematic spectroscopic measurements of the Near-InfraRed (NIR) hydrogen recombination lines Paschen alpha (Paα λ = 1.875 μ m) and Brackett beta (Brβ λ = 2.626 μ m), produced by pre-main-sequence (PMS) stars. These stars, consisting of T Tauri and Herbig AeBe stars are located in the massive Galactic star-formation region NGC 3603. The measurements were obtained from JWST NIRSpec, using multi-object spectroscopy (MOS) mode. Utilising existing empirical relations between Lacc and L_Brγ, we have used our new measurements to formulate, for the first time, an empirical relationship between the accretion luminosity Lacc of the stars, and the line luminosities Lₗᵢₙₑ of both Paα and Brβ. These relationships are: log₁₀( LaccL_) = 1.42 (± 0.18) × log₁₀( L_PaαL_) + 3.33 (± 0.42) and log₁₀( LaccL_) = 1.47 (± 0.18) × log₁₀( L_BrβL_) + 4.60 (± 0.57). These new relationships are key for roughly estimating the accretion rates for large samples of PMS stars with JWST.
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Rogers et al. (2024) studied this question.