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Why don't (or can't) stars be more than 325 or so times the mass of the sun? What limits their size?

There is basically an upper limit to the mass of a star because their luminosity is so great that the radiation pressure prevents the accretion of further mass. However, the upper limit depends on the ...
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2 votes
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Where is the habitable zone of a Hypergiant?

I note that in old style space opera type stories, such as Star Trek, it is common to mention and visit habitable planets orbiting around types of stars which should not have habitable planets for ...
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1 vote
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What is the brightest star (relative magnitude) in M31?

The Variable stars that Hubble studied in M31 when he showed that it was a galaxy are among the most luminous. They include Var-A1, a luminous blue variable, and magnitude about 16.5. Var A-1 is one ...
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1 vote

How massive can a star be at birth?

I found a text that suggests a Population III star can have a mass between 200 and 10^5$M_{Sun}$. There you can read: "...This would apply for VMOs larger than $M_c$ $\approx$ 200 $M_{Sun}$. Stars ...
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