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Homework Help: Astronomy Spectroscopy help

  1. Nov 16, 2006 #1


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    Hello all,

    I am currently doing a 3rd year Astronomy and Astrophysics course and I am having some trouble with the current problem set (this is mainly because our teacher doesn't really teach us anything but that's another story).

    This is the question in particular that is bothering me:
    2) Let’s assume that Star A has surface temperature of 10000 K and moving away from us at 1000 km/s. First, draw (or sketch) its observed continuum radiation in the 0.1 – 2.0 micron range. Specify the wavelength where the continuum emission is most intense. What’s the dynamic range (=maximum/minimum) of the continuum emission in the given wavelength range?

    I tried looking on the internet for continuum radiation (and later found that its also called braking radiation or Bremsstrahlung) but I could not find anything useful.

    So I was wondering if anyone could give me a quick lesson on how I would sketch this continuum radiation in this range? Should I find a function using the electron transition equations?

    I am really clueless here and any help would be really appreciated.

  2. jcsd
  3. Nov 16, 2006 #2


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    Ok I see what he is asking now... he just wants the blackbody graph in this range.
  4. Nov 17, 2006 #3

    George Jones

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    Right, but don't forget about the Doppler shift.

    Find the curve for a 10000 k blackbody, and then make the shift to longer wavelengths that is appropriate for a source recessional velocity of 1000 km/s.
  5. Nov 17, 2006 #4


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    Yeah I remembered to do that, although the shift for 1000km/s is hardly noticeable anyways.
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