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Old 30-06-2020, 10:39 AM
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gary is offline
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Betelgeuse dimming most likely caused by giant star spots - new study

29th June 2020

Originally Posted by Max Planck Institute for Astronomy
Betelgeuse, the bright star in the constellation of Orion, has been fascinating astronomers in the recent months because of its unusually strong decline in brightness. Scientists have been discussing a number of scenarios trying to explain its behaviour. Now a team led by Thavisha Dharmawardena of the Max Planck Institute for Astronomy have shown that most likely unusually large star spots on the surface of Betelgeuse have caused the dimming. Their results rule out the previous conjecture that it was dust, recently ejected by Betelgeuse, which obscured the star. The results are published today in the journal The Astrophysical Journal Letters.
Full press release here, with images :-

Paper at arXiv, "Betelgeuse fainter in the sub-millimetre too:
an analysis of JCMT and APEX monitoring during the recent optical minimum" by Dharmawardena et. al :-
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