Spectrum Synthesis (Payne NLTE)

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  • Quick Start

    1. Choose a Payne model:
      • 4most-hr — R≈20k. 3 windows: 3926-4355, 5160-5730, 6100-6790 Å. Δλ = 0.05 Å.
      • 4most-lr — R≈7k. 1 window: 3700-9450 Å. Δλ = 0.25 Å.
      • 80k — R≈80k; 3 windows: 3925-6800, 7700-7800 (for O 777 line), 9050-9130 (for some C I lines) Å. Δλ = 0.05 Å. When selected, a Resolution (R) field appears—enter your spectrum's resolving power to degrade Payne to the requested resolution (slower fitting though) or leave blank.
    2. Paper citation:
      • Storm et al. 2025b subm. This is a beta version, please report any bugs, problems etc. Please wait until publication of the paper to use this tool for scientific results.
    3. Known issues:
      • - loggf values are 0.31 dex too low for all diagnostic lines of Eu in the blue window. This means that all abundances are ~0.31 dex too high.
      • - Too large files cannot be uploaded.
    4. Date of last change to the code (keep track of it if you use this tool):
      • 2026 March 26: Added more QoL features

    Stellar parameters

    Neural Network Model library

    Observed spectrum

    Expected format:
    2 columns — wavelength (Å), normalised flux; other columns are ignored.
    Supports space or comma-separated .txt, .dat, .spec, .ascii, .csv files.
    Lines starting with # are ignored.

    Spectral interval from to SNR
    Parameter Value Min Payne Max Payne
    RV
    Teff35008000
    logg0.55
    [Fe/H]-50.5
    vmic0.55
    vsini
    vmac
    A(Li)03.5
    [C/Fe]-12
    [O/Fe]-0.51.25
    [Na/Fe]-0.750.75
    [Mg/Fe]-0.51
    [Al/Fe]-0.80.5
    [Si/Fe]-0.251
    [Ca/Fe]-0.41
    [Ti/Fe]-0.51
    [Cr/Fe]-0.50.5
    [Mn/Fe]-10.5
    [Co/Fe]-0.31
    [Ni/Fe]-0.251
    [Sr/Fe]-1.51
    [Y/Fe]-0.750.5
    [Ba/Fe]-21
    [Eu/Fe]-12
    Generating spectrum - please wait…
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