Betelgeuse’s surface before and during its 2019–2020 Great Dimming.
2019년과 2020년 사이에 발생한 전례없는 밝기 감소동안에 베텔게우스의 표면.

These images, taken with the SPHERE instrument on ESO’s Very Large Telescope, show the surface of the red supergiant star Betelgeuse during its unprecedented dimming, which happened in late 2019 and early 2020.
M. Montargès et al. report high-angular-esolution observations showing that the southern hemisphere of Betelgeuse was ten times darker than usual in the visible spectrum during its Great Dimming. Observations and modelling support a scenario in which a dust clump formed recently in the vicinity of the star, owing to a local temperature decrease in a cool patch that appeared on the photosphere.

유럽남방천문대(ESO)의 VLT(Very Large Telescope) 망원경에 장착된 스피어(SPHERE) 장비로 촬영한 이 이미지는 2019년 말과 2020년 초에 발생한 전례없는 밝기 감소동안 적색 초거성 베텔게우스의 표면을 보여줍니다. 
베텔게우스는 적색 거성으로 오리온자리에서 가장 밝은 별입니다. 2021년 6월 16일, 천문학자 미구엘 몽타르제스 박사가 이끄는 연구팀은 '네이처(Nature)'에 발표한 연구 결과에서 베텔게우스의 '급격한 밝기 감소'는 이 별의 남반구 일부지역 온도가 떨어지면서 발생한 먼지구름이 별빛을 가리면서 발생한 것이라고 분석하였다.

A dusty veil shading Betelgeuse during its Great Dimming :


Credit: 염범석 Bum-Suk Yeom, AAVSO, ESO, M. Montargès et al.


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