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Unformatted text preview: Astronomy 10, Fall 2008 Homework 6 - 40 points total Due in the boxes in the basement of Campbell Hall by 5pm Tuesday, October 21 . Be sure to include your name, SID, Section Number, and GSI name on your homework, and staple it together. 1. Measuring the Stars, Part I (12 points) While observing with your already well-used telescope and spectrograph, you come upon a star whose spectrum looks rather unlike a blackbody. (See the solid line in the graph below.) After thinking about it for a while, you realize that the spectrum might be that of two stars that are too close together for your telescope to resolve. Sure enough, you find that the spectrum can be reproduced by adding two blackbody curves together. The two separate blackbodies that do the job are shown as the red and blue curves in the graph. For this problem, we’ll use the subscript “b” to refer to the star that produces the blue curve, and “r” to refer to the star the produces the red curve. (a) What are the surface temperatures of the two stars, T b and T r ? (3 points) (b) Being the dedicated astronomer that you are, you’ve actually been observing this pair of stars for many months now. Looking back over your observations, you see that the system appears to have moved slightly relative to other stars in the sky around it. In particular, you notice that the pair has moved 0 . 04 arcseconds from where it was six months ago. Assuming the stars are a true binary system and not just a chance alignment along the same line of sight, how far away are the stars? (3 points)are the stars?...
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- Fall '06
- Astronomy, red line