1. CCD Imaging of Variable Stars Kimberly Anderson Joshua Smith December 3, 2002

2. Outline Significance of Variable Star research Process of data collection and submission Example of data that we submitted

3. What are Variable Stars? Vary in intensity Two types:  Intrinsic: internal changes  Extrinsic: external effects

4. American Association of Variable Star Observers (AAVSO) Consists of independent observers, gathering and submitting data Analyzing data of variable stars creates better understanding of astronomical phenomena

5. Capturing Variable Star Image Attach CCD camera Focus Capture image, check with star chart Determine best exposure time

6. Analysis of CCD Image Adjust brightness Identify variable star Find relative magnitude Cross check magnitude using second star Submit data with observation time (Julian date)

7. Light Curve Example: U Aur

8. Light Curve Example: VW Hyi

9. Weblog Used weblog to journal progress, thoughts and reactions Available at: http://macman.ross.clarkson.edu

10. Conclusion Disappointed that we were only able to make observations once Learned the significance of variable stars and some possibilities in astronomy using computer technology