The Flare Star RX2201
Some stars are like our sun and have spots on them caused by strong
magnetic fields. Sometimes these strong magnetic fields break
an explosion results, which we call a flare. Last year
we looked at this star because it was an X-ray source and a
rapid rotator, making us think that it was probably a variable star.
We observed the stars brightness variations and found that the
brightness of the star changed with an amplitude of 0.02 magnitudes
and a period of 0.448 days. We also observed six flares on the star.
We were astonished to see that the flares seemed to be periodic
with a period of 0.4421 days! See our paper here.
automated 0.5 meter telescope.
we take pictures of this star and the nearby stars. We measure the
brightness of the 9 brightest stars and compare them one to each other.
If it becomes cloudy then all the stars will become fainter by the same amount
and their relative brightness will not change.
This is a picture of RX2201 taken with our telescope
Presently we are participating in an international campaign to
keep this star under constant observation for a week. Our
observers are teams headed by
Here is the data that we have gathered so far in the campaign.
Mike Gladders in Toronto
- N.D. Melikian in Armenia,
- Soeren Frandsen in Denmark,
- Mansur Ibrahimov in Uzbekistan,
- Yong-Jong Sohn in Korea.
Send comments/suggestions/problems to robb@