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. in prep. This is a beta version, please report any bugs, problems etc. Please wait until publishing of the paper to use this tool for scientific results.
Stellar parameters
Neural Network Model library
4MOST-HR NLTE (R=20k) 4MOST-LR NLTE (R=7k) High Res NLTE (R=80k)
Observed spectrum
Overlay observed spectrum Source: Your own uploaded spectrum HD 140283 (4MOST-HR) HD 84937 (4MOST-HR)
Spectral interval
from to Add Gaussian noise SNR
Reset to defaults
Parameter	Value	Min Payne	Max Payne
RV
Teff		3500	8000
logg		0.5	5
[Fe/H]		-5	0.5
vmic		0.5	5
vsini
vmac
A(Li)		0	3.5
[C/Fe]		-1	2
[O/Fe]		-0.5	1.25
[Na/Fe]		-0.75	0.75
[Mg/Fe]		-0.5	1
[Al/Fe]		-0.8	0.5
[Si/Fe]		-0.25	1
[Ca/Fe]		-0.4	1
[Ti/Fe]		-0.5	1
[Cr/Fe]		-0.5	0.5
[Mn/Fe]		-1	0.5
[Co/Fe]		-0.3	1
[Ni/Fe]		-0.25	1
[Sr/Fe]		-1.5	1
[Y/Fe]		-0.75	0.5
[Ba/Fe]		-2	1
[Eu/Fe]		-1	2
Run synthesis
Generating spectrum - please wait…