Color-Color Diagrams
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Color-Color Diagrams

 Click on the image for a larger view

Astronomers study the temperatures of other stars using a graph called a color-color diagram. To make a color-color diagram, find two colors of a single star; for example, g-r and u-g. Then, make a graph with u-g on the x-axis and g-r on the y-axis. The star you found will plot into a point on the diagram. Find colors of several other stars and plot them on the same graph. The image at the right shows what a hypothetical color-color diagram might look like.

Explore 5. Use SkyServer's Object Explorer to find the stars with the following object IDs in the SDSS database. Click on one of the Object IDs to open the Object Explorer. Write down each object's ID and its magnitudes through SDSS's five filters - they are the quantities u, g, r, i, and z in the second row on the right of the object's image.

Record your data in this workbook.

 Object ID ra dec 587729409159726385 261.53089 27.8252 587729652355957714 259.45503 26.13354 588015508200030302 10.01782 -0.75441 588015509283012681 31.16766 0.16188 588848898826305740 151.18504 -0.92994 587722981743526024 187.87919 -1.08739 587722982817988795 189.45609 -0.29485 587725576963162456 262.90111 57.66249 588015508214317186 42.6732 -0.75043 588848899371434096 169.97091 -0.53913 587729782276817397 261.36639 27.56075 588848899397124437 228.71353 -0.4823 587722983357153451 194.75972 0.1813 587722982824280273 203.88511 -0.32011 587731186746261653 12.51927 0.39023 588848900467654983 221.42084 0.32477