nichola

How would I go about estimating a stars apparent visual magnitude using only my eye's?Advice or good internet site is appreciated.

Why do widths/strengths of spectral lines differ between supergiant stars and main sequence? Does the density of gases in the outer layers play a part?

I have two stars A = 7150K and B = 4850K.A is 20 times brighter than B. Assuming L/Lv is the same for both stars find the ratio ofthe radii of A and B. I have the equation R/R= (L/L)^1/2(T/T)^2. I can do this for each star in terms of solar masses but i a...

If blackbodies emit over all wavelengths will x rays be emmited by my cooker element?Which emits mostly in the infrared?

Thanks for the applet.Am I right in thinking blackbodies radiate at all wavelengths but only very little at short wavelenghts if cooler?