what is the right ascension of the sun on the vernal equino what is the right as

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what is the right ascension of the sun on the vernal equino what is the right ascension of the sun on the vernal equino what is the right ascension of the sun on the vernal equino what is the right ascension of the sun on the vernal equino 32. 120 marks] The red supergiant VV Cephei (MK classification: M2 lab, the same as Betelgeuse) has a radius R = 1050 RO and an effective temperature of Teff = 3826 K. What is the logarithm of the luminosity in solar units (log L/Lo)? The symbol O refers to the value of that quantity for the Sun, i.e., 1 Ro means one solar radius.

Explanation / Answer

The formula for luminosity is given as L = R^2 T^4

now,

let the temperature of the sun is 5778K. Let this temperature be To

so temperature of new star = 3826 K = 0.6621 To

so,

L/Lo = (R^2T^4) /(Ro^2 * To^4)

=1050^2 * 0.6621^4

=2.11*10^5

so log(L/Lo) = log(2.11*10^5)

=5.324

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