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Imagine the Universe!
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Contents

College Hera Home

Pretest

Ready To Go

Eclipsing Binaries

Light Curve Matching

HT-Cas Exercise
Exercise 1
Exercise 2
Exercise 3

Next Steps

Installing Hera

Using Hera
Exercise 4
Exercise 5
Exercise 6

Conclusion

HERA Tool: File Plot 2

The periodicity on this plot for this binary system, or any plot with only 100 rows isn't easy to see. Experiment with more rows until you find out how much time, i.e., how many rows, you need to best estimate the periodicity. It will take a while to plot lots of data -- be patient! When you decide on the clearest choice of rows to estimate the period, print it out.

Exercise 5
What do you see when you plot 500 rows? 1000 rows? 4000 rows? 10,000 rows?

Write a paragraph explaining the changes that you see:

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Imagine the Universe! is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA's Goddard Space Flight Center.

The Imagine Team
Project Leader: Dr. Barbara Mattson
Curator: Meredith Gibb
Responsible NASA Official: Phil Newman
All material on this site has been created and updated between 1997-2013.
Last Updated: Sunday, 16-Dec-2012 22:17:31 EST

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