- 3 To Start We Are Going To Classify Stars Based On The Strength Of Their Hydrogen Absorption Lines Specifically The 1 (78.28 KiB) Viewed 27 times
specifically the Hα line. Look at the blowup of the Hα 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 Hα line in the bottom graph of each panel by following the procedure
below:
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 HQ line in the bottom graph of each panel by following the procedure below: a) Draw a straight line in the bottom graph of cach 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 arca 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 cach panel in Table 1 Table 1 Strength of Ho line (# of boxes) Panel 1 22 B 4 16