Recent content by Toad

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    Finding the mass of stars that evolved away.

    Thanks for that page. Is there some way to relate the age of the star to its luminosity? Do I need to do that? Thanks!
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    Apparent Magnitude of Sun at 8000 Parsecs from Galactic Center

    The extinction to our galactic center is about Av=20mag. What would be the apparent magnitude of our sun at the 8000parsec distance of the galactic center? From what I know, I think I need to use http://en.wikipedia.org/wiki/Absolute_magnitude#Computation the luminosity-distance formula. So...
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    Calculating wavelengths of photons / photospheric temperatures

    Well... it has a black body spectrum. I supposed it relates with Planck's law of black body radiation? http://en.wikipedia.org/wiki/Planck_function I'm still not exactly sure what to do. Thanks!
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    Finding the mass of stars that evolved away.

    The information I posted above is all I've been given. If there are common formulas for this available, I suppose I don't need to derive them. Thanks!
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    Calculating wavelengths of photons / photospheric temperatures

    The ionization potentials of HI and KI are 13.6 and 4.3 ev. Calculate the wavelengths of photons that can ionize HI and KI. Calculate the photospheric temperatures of stars that peak at these wavelengths, and hence radiate plenty of photons at shorter wavelengths capable of ionizing these...
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    Finding the mass of stars that evolved away.

    If the stars in the Pleiades open cluster are about 100*10^6 years old, how do I find the mass of the stars that evolved away from the main sequence to form red giants? Any suggestions or comments are welcome! Thanks!
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