Famous Supergiant Star Betelgeuse May Not Be Alone, Pg11

Key Highlights:

• Astronomers have found strong evidence for a close companion star, now named Betelgeuse B, orbiting the famous red supergiant Betelgeuse.
• The discovery was made using the Very Large Telescope (VLT).
• Betelgeuse B is estimated to be 2.6 to 3.1 times as massive as our Sun.
• This companion star is believed to be responsible for the six-year cycle of brightness variations observed in Betelgeuse.

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Detailed Insights:

• Betelgeuse is a prominent red supergiant star located in the Orion constellation, known for its distinct reddish hue and variability in brightness.
• The star exhibits both a primary brightness variation period of approximately 400 days and a longer, secondary period of around six years.
• The existence of a companion star to explain Betelgeuse's brightness changes has been a hypothesis among astronomers for about a century.
• The direct imaging of Betelgeuse B was achieved using the SPHERE instrument on the VLT.
• Confirmation of the companion's orbital path is pending a second observation.
• The Very Large Telescope (VLT) is an advanced astronomical facility operated by the European Southern Observatory (ESO), located in Chile's Atacama Desert.

Scientific/Technical Concepts Involved:

• Red Supergiant: A star in the late stages of its life cycle, characterized by its immense size, relatively cool surface temperature, and reddish appearance.
• Binary Star System: A system of two stars gravitationally bound to each other, orbiting a common center of mass.
• Very Large Telescope (VLT): A ground-based astronomical observatory comprising four large optical telescopes that can operate individually or together as an interferometer.