ChromaStarServer (formerly "GrayStarServer")

OpenStars approximate stellar atmosphere and spectrum synthesis modeling in Java.
User interface in JavaScript + HTML5. Hover for tips. Click for data coordinates. Ctrl +/- to zoom

Optional plots: Spectrum synthesis (Warning: Slow) Atmosphere Chem Eq (if Atmos plots ON) Radiation field

Star inputs:

Surface temperature, Tsurf
(3000 - 50000) K)

Log10 surface gravity, log(g)
(0.0 - 5.5 cm s-2 = dynes g-1)


Mass
(0.1 - 20.0 MSun)


Metal content
(log10 0.001 - 10.0 x solar)

Microturbulence, ξ T , (0.0 - 8.0 km s-1)
κFudge log10 mass extinction (-2.0 - 2.0 log cm2 g-1)
[He/Fe] (-1 - 1)
 [C/O] (-2 - 2)
 [α/Fe] (-0.5 - 0.5)

Stellar outputs

Planetary inputs:

Affects Habitable zone and Transit light curve

Surface pressure
(0.6 - 22000 kPa)

Greenhouse effect, ΔT
(-200 - +600 K)

Albedo (0.0 - 0.95)

ROrbit (AU) (0.01 - 50)

RPlanet (REarth) (0.1 - 20)

iRot (0 - 90 o)
Organic solvent
Water Methane Ammonia Carbon dioxide

Planetary outputs

Modeling realism vs performance

ONLY update spectral line
 No. HSE-EOS-Opac iters
 No. Pe-IonEquil-MolecEquil iters
 TiO bands (C3Δ-X3Δ, c1Φ-a1Δ, A3Φ-X3Δ)

Spectrum synthesis parameters

Warning: Inreasing the range between λStart and λStop or decreasing the ratio κl/κc will increase the computing time significantly.

View the ascii line list

Minimum log10κl/κc for inclusion (-4.0 - 6.0)

 Log10 Broadening enhancement, γExtra (0.0 - 1.0)

λStart (260 - λStop nm)

λStop (λStart - 2600 nm)

RV (-200 to +200 km s-1)

vMacro (0 - 8 km s-1)

vRot (0 - 20 km s-1)

iRot (0 - 90 o)

λ-scale in vac/air: Vacuum Air
 Spectral line λ sampling:
Coarse (good for quick recon only) Fine

Narrow band Gaussian filter λ (270 - 2550 nm) σ (0.01 - 10 nm)
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 Transit light curves JSON string