# Questions tagged [eddington-luminosity]

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### Red supergiants with luminosities significantly above the Humphreys-Davidson limit?

The M33 red supergiants (RSDs) LGGS J013312.26+310053.3 and LGGS J013339.28+303118.8 both have luminosities significantly above the Humphreys-Davidson (HD) limit (logL 5.76 and 5.68 [source], ...
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### How can the upper limit for a star's mass be calculated?

I know there is a theoretical mass limit for stars around $300 M_\odot$. But I cannot find a way to calculate that number. I tried to use the "Eddington Limit", but I don't know if I'm on ...
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### What is an actual value for the Eddington pulsation constant?

What numerical value does the pulsation constant $Q$ take in the formula that Eddington derived for variable stars: $$P\sqrt{\rho} = Q,$$ where $\rho$ — average star density, $P$ — period?
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### How does the Eddington limit make the gravitational field of stars asymmetric?

This answer to Is the gravitational field of the sun uniform? says: Very large stars are asymmetric due to being close to the Eddington limit. The Sun is too small of a star to have the kind of ...
We know Eddington Limit (Eddington Luminosity) is calculated with this formula: $$L_{Ed} \approx 3 * 10^4 * L_{sun} * \frac{M}{M_{sun}}$$ Example: For a black hole with $10^4 M_{sun}$, we get L_{...