HW7-Cen_X-3_&_GK-Per - Cen X-3 and GK Per HW 1)...

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Cen X-3 and GK Per HW 1) Using your eyes, and looking at a (zoomed) portion of the Cen X-3 light curve, what is your best estimate for the period of variability of this x-ray source? When you zoom in using DS9 to isolate a small portion of the light curve (about 50-100 seconds will do), you can clearly see that the source is varying over a period of about 5 seconds. 2) How does this compare with the "exact" result that is output from the value obtained by the power spectrum? Are you surprised by the difference? Why does the power spectrum provide a more accurate answer?
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This compares quite well with the power spectrum peak at .208 Hz, which would correspond to a period of 4.81s. The power spectrum uses the entire observation of the source as its means for calculating any period, therefore it only makes sense that a computer would be able to do this better than your eye can. By considering thousands of seconds of data, you can get much more precision. Note that you could come closer to
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This note was uploaded on 10/25/2009 for the course PHYSICS Astronomy taught by Professor Me during the Spring '09 term at Akademia Ekonomiczna w Krakowie.

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HW7-Cen_X-3_&_GK-Per - Cen X-3 and GK Per HW 1)...

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