A science education research paper, 'Changes in participants' scientific attitudes and epistemological beliefs during an astronomical citizen science project', written by Aaron Price and Hee-Sun Lee has been published in the Journal of Research in Science Teaching (JRST).
Our own Donna Young has created an educational activity about variable stars on the HR Diagram. The activity is designed for formal K-16 educators and includes a teacher's guide, background material, student activities and answer keys.
However, the activity is also a great learning tool for those new to variable stars. It will introduce many of the most important types of variable stars and describe how they are related to other types. The genius of HR Diagrams is how they place everything in context of the grand scheme of things.