Ok I get it know :D. I'm really greatful for your help, and I'm delighted that such a tutors exist. I was never good at astronomy. Again thank you very much for your time.
Ok i found it. Δλ = λ*ν*sini/c, and if the axis of rotation is perpendicular to the direction of view sini = 1 so v = Δλ*c/λ. To know the period of the star's rotation we use the formula T=2πR/v. L = 4πR²σT4 from this formula I want to designate R. So I need to find L. Can i designte L from the...
I know that as a result of the rotation one half of the disc Star is coming at us, and the other is moving away, resulting in a Doppler upcoming star of the disc causes shift towards blue line on the receding part - the red. And i supose that we can designate speed form this. But I don't know...
Homework Statement
Find period of the star's rotation assuming that the axis of rotation is perpendicular to the direction of view.
Given data:
- distance d = 25 pc
- bolometric luminosity observed m = 8m
- effective temperature T = 4000 K
- bolometric absolute brightness of the Sun Mm = 4,75m...