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D UWC iKamva: EWP 211 S1 2022 X Photometry_of_the_Pleiades.pdf x DD Spectral_Classification.pdf х + _ х 个 → File C:/Users/User/Downloads/Spectral_Classification.pdf @ Тр 3. To start we are going to classify stars based on the 'strength of their hydrogen absorption lines, specifically the Hą line. Look at the blowup of the Hą line in each panel. You will notice that each line dips down vertically and has a horizontal width associated with it. Absorption line 'strength' depends both on how much the line dips down and how wide it is. Measure the strength of each Hą line in the bottom graph of each panel by following the procedure below: a) Draw a straight line in the bottom graph of each panel by connecting the triangles located at 6510 and 6610 Ångstroms. In doing so you are tracing the continuum near the absorption line. b) Lightly shade in the absorption line now enclosed by the continuum. c) The strength of an absorption line is the area enclosed by the absorption line, Measure the area by estimating the number of boxes contained inside of the absorption line. (This may be difficult to estimate as there will be "partial” boxes to consider, just do your best.) Record the strength (in number of boxes) of the absorption line in each panel in Table 1. Panel Table 1 Strength of Ho line (# of boxes) 5 4. Originally astronomers classified those stars with the strongest hydrogen lines as 'A' stars, stars with the next strongest lines as 'B' stars, the next strongest 'C' and so on. Eventually some letters were deemed unnecessary and dropped from the classification sequence. The letter assigned to a star is termed its spectral class. Assign a spectral class to each panel by following the procedure below: a) In the second column of Table 2, list the panel numbers from strongest Hą line at the top to weakest Họ line at the bottom. b) Each panel corresponds to one of the following classes of stars: A,B,F,G,K and O. (We're skipping some letters here.) In the third column mark the letter that corresponds to each panel using the lettering scheme described above. Table 2 Panel Number Spectral Class strongest Hot line to weakest (Letter Designation) strongest A B F G K O weakest *Spectral Classification Lab at https://sites.google.com/a/uw.edu/intro ... -exercises