Search Results

9 results for “stars”

Formulae (9)

\binom{n+k-1}{k-1}

Ways to distribute n identical items into k distinct groups.

L = 4\pi R^2 \sigma T^4

Luminosity of a star from radius and temperature.

d = \frac{1}{p}

Distance in parsecs from parallax angle in arcseconds.

b = \frac{L}{4\pi d^2}

Observed brightness from luminosity and distance.

m - M = 5\log_{10}(d) - 5

Relates apparent and absolute magnitude to distance.

\lambda_{max} = \frac{b}{T}

Peak emission wavelength of a blackbody.

\frac{L}{L_\odot} \approx \left(\frac{M}{M_\odot}\right)^{3.5}

How a main-sequence star's brightness scales with its mass.

L_{Edd} = \frac{4\pi G M m_p c}{\sigma_T}

The maximum steady luminosity before radiation blows a star apart.

T_{sid} = \dfrac{T_{sol}}{1 + T_{sol}/T_{yr}}

Earth's rotation period measured against the stars, not the Sun.