Stargazing News - May 14th, 2025
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All on Tue May 13 06:12:47 2025
Wednesday May 14, 2025
Variable Stars in Corona Borealis (evening)
Corona Borealis, the Northern Crown contains several noteworthy variable
stars. Alphecca is an Algol-type eclipsing binary system that varies by 0.1 magnitudes every 17.36 days. Eruptive variable stars are named for R Coronae Borealis, which is located 3.5 degrees northeast of Alphecca. R Corona
Borealis is a hydrogen-deficient and carbon-rich supergiant star. From time to time, it's usual visual magnitude of 5.8 drops to as little as magnitude 14, possibly due to the formation of opaque carbon dust that blocks visible light, but passes infrared. The star S Coronae Borealis exhibits the same range of variability, but with a 360-day period. The Blaze Star (T Coronae Borealis) is a cataclysmic variable star, also called a recurrent nova-type. Normally shining between visual magnitude 10.2 and 9.9, on rare occasions it has brightened to magnitude 2 in a period of hours, caused by a nuclear chain reaction and the subsequent explosion. For more than the past years, astronomers have been expecting T CrB to go nova.
(Data courtesy of Starry Night)
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