Astronomers Observe Binary Star Orbiting Stellar Giant Betelgeuse
WASHINGTON (Reuters) — Betelgeuse is a superstar among the stars — one of the brightest in the night sky, a massive red supergiant in the constellation Orion that sometimes brightens and dims, and adds to its allure with the fact that it may be on the brink of exploding.
Betelgeuse, a massive red supergiant located in the constellation Orion, has long been a bright and enigmatic presence in the night sky. This star, 16.5 to 19 times more massive than our sun, is also 750 to 850 times larger in physical size. Its luminosity is approximately 100,000 times that of the sun, making it one of the most brilliant stars in the universe.
For centuries, astronomers have observed the variable brightness of Betelgeuse, which has led to speculation about its ultimate fate. Recent research, however, has revealed a crucial detail about this stellar giant: it is not alone. A companion star orbits Betelgeuse in a binary system, according to a study published in the journal Astronomy & Astrophysics.
The newly discovered companion star is 2.6 to 3.1 times more massive than the sun and has a diameter 1.8 to two times greater than that of Betelgeuse. Together, the two stars are gravitationally bound and orbit each other at a distance roughly equivalent to the distance between Saturn and the sun. This observation, representing the first unambiguous detection of a companion star, was made using the European Southern Observatory's Very Large Telescope in Chile.
The presence of this companion star could significantly impact the future of Betelgeuse. Massive stars like Betelgeuse typically reside in binary systems or systems with multiple stars. According to lead author Miguel Montarges, massive stars should not form as single entities. Previous research had suggested that Betelgeuse's variable luminosity was due to a hot and dense cloud of material expelled by the star, which cooled and formed dust, sometimes obscuring its light.
However, the newly discovered companion star could provide additional insight into the complex processes governing the life cycle of this colossal star.
Betelgeuse is estimated to be around 10 million years old, making it significantly younger than our sun, which is about 4.5 billion years old. As a prelude to a supernova explosion, Betelgeuse is expected to undergo dramatic changes in the near future. If the companion star interacts with Betelgeuse, it may delay or accelerate the supernova event. With this new information, astronomers are left uncertain about the exact timing of Betelgeuse's demise.
Written by urgent.news from The Japan News by The Yomiuri Shimbun's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
