If I knew what I was looking for this would be much easier.
Student motivation more important than math/science literacy IRAF hard to get on high school computers Teacher collaboration helpful Lots of support for astronomy education: NITARP, AAVSO, Lift Off, Project Astro, etc.
Variation in absorption of various elements Indicative of varying density of the disk Possible Ring Structure
Eqw minimum Eqw maximum Leadbeater/Stencel plateaus
Measure the days of a min or max Find fraction of orbit this represents: width of ring = min or max days/(27.1 * 365) Represent fraction angle (* 360) Knowing the radius 18.1 AU, use small angle approximation (sin or tan) to find ring width 18.1 AU Fraction of orbit = (20 days ) *360 (27.1*365) = 0.73 Ring Width = tan 0.73 * 18.1 = 0.23 AU
1990 – S. Ferluga: disk is actually a series of concentric rings with gaps between them (like rings of Saturn) Ferluga (1990, A&A, 238, 270) Our result predict an outer ring at a radius of 3.3AU, a wider ring with radius 2.8 AU, and two small inner rings with a radius near 1.5 AU. These two small rings may represent the one inner ring. Our results are similar to Ferlugas prediction.
Take data 2 or more times every week Examine the spectra for more information: H alpha emission and absorption components Changing molecular bands (CN, CH) FWHM interpretation