Tuesday, 21 December 2010

astrophysics - Relationship between absolute magnitude of a star and its luminosity?

  • Why does this relationship involves the absolute magnitude of the sun and its luminosity?

  • How to derive an expression relating the absolute magnitude of a star to its luminosity?

So according to the magnitude equation, mM=2.5logleft(fracd2d02right)
RightarrowM=m2.5logleft(fracd2d02right)(eq1)



and Luminosity is L=4pi(d2)timesf
Rightarrowd2=fracL4pitimesf(eq2)



Plugging eq2 to eq1 would have seem reasonable, but how is absolute magnitude of the sun and its luminosity used?

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