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Star HD 189733 is flaring in half of its observations. Astronomers also found out that the variability is significantly different in different parts of the electromagnetic spectrum.
|XMM-Newton||10. 12. 1999||Ongoing|
The star has about 83 % of solar mass. In its system there is also another smaller star and a jupiter-sized exoplanet. The presence of the exoplanet might be the cause of difference in variability.
||HD 189733||64.5 ly||
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Astronomers led by Byeong-Cheol Lee have made a groundbreaking discovery, detecting a brown dwarf orbiting the red giant HD 18438. With a radius of 89 times that of the Sun, HD 18438 is now the largest known star to be orbited by an exoplanet or brown dwarf.