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sci.stellar-luminosity-HR-diagram Calculator
Calculates stellar luminosity from radius and temperature using Stefan-Boltzmann: L = 4πR²σT⁴, normalised to solar values. A star 2× the Sun's radius at the same temperature (5,778 K) is 4× more luminous — red giants 50× the solar radius but only 3,000 K have luminosities comparable to the Sun.
Inputs
T Eff K
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
R Solar
Distance from centre to edge of a circle. Radius = diameter / 2.
Results
luminosity L (solar luminosities)
Total power output of a star or light source in watts or solar luminosities. Relates to absolute magnitude.
luminosity L (watts)
Total power output of a star or light source in watts or solar luminosities. Relates to absolute magnitude.
absolute bolometric magnitude M_bol
Sample size or count used in the calculation.
spectral class
The classification assigned based on the computed value.