Imagine the Universe!
Imagine Home | You Be the Astrophysicist! |

X-ray Data From HT Cas

HT Cas data from ASCA

Here are part of the X-ray data from observations of HT Cas. Although a lot noisier than the sample binary data, you can still see the general shape of the curve and how the X-ray intensity drops as the X-ray emitting star is eclipsed by the central star. It might be easier to print out this page and measure from the printed version, rather than from the screen.

The orbital velocity of the secondary star in the HT Cas system is 390 km/sec. Using this information and the ASCA light curve above, calculate the size of the central star.

HINT: distance as function of time and

Warning: Do not type a comma in your answer!


If words seem to be missing from the articles, please read this.

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 1997-2014.
This page last updated: Wednesday, 04-Oct-2006 11:25:14 EDT