The ATLAS9 grid of stellar atmospheres and synthetic spectra in the ChromaStar UI. User interface in JavaScript + HTML5. Hover for tips. Ctrl +/- to zoom


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Stellar parameters
Effective temperature, Teff
Log10 surface gravity, log(g)
(0.0 - 5.5 cm s-2 = dynes g-1)
Metal content
(log10 0.1 - 1.0 x solar)
Microturbulence, ξ T , (2.0 - 2.0 km s-1)
Stellar mass
(0.1 - 20.0 MSun)
κFudge log10 mass extinction (-2.0 - 2.0 log cm2 g-1)

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Habitable Planet Zone parameters
Surf pressure
(0.6 - 22000 kPa)
Greenhouse effect, ΔT
(-200 - +600 K)
Albedo (0.0 - 0.95)
Organic solvent
Water Methane Ammonia Carbon dioxide

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Spectrum synthesis parameters
Warning: Inreasing the range between λStart and λStop or decreasing the ratio κl/κc will increase the computing time significantly.
λStart (260 - λStop nm)
λStop (λStart - 2600 nm)
Labeled species

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Narrow band Gaussian filter λ, (270 - 2550 nm) σ, (0.005 - 10 nm)
Plots: Spectrum synthesis (Warning: Slow) Atmosphere Chem Eq (if Atmos plots ON) Radiation field
Detailed print-out (below graphs): None Spectrum synthesis Atmospheric structure Flux spectral energy distribution (SED) Specific intensity distribution Limb darkening coeffs Partial pressures A12 abundances JSON string