What a Star Looks Like Close up: Landmark Betelgeuse Images Decoded
The visual anomalies mapped across Betelgeuse are not caused solely by internal thermodynamics. Investigations reported by Live Science and Science News confirm that the red supergiant is likely not flying solo. The system shows mounting evidence of being a binary star system.
For years, astrophysicists debated why Betelgeuse pulsates on two distinct cadences: a short fundamental mode lasting roughly 420 days and a long secondary period spanning approximately 2,170 days. Internal convective sloshing accounts for the shorter cycle, but could not produce the longer rhythm without violating the known laws of red supergiant interior physics.
The solution emerged when astrometric and spectral measurements tracked an elusive companion star orbiting close to the supergiant's tenuous outer boundary. Informally nicknamed "Betelbuddy," this estimated solar-mass companion acts as a gravitational snowplow.
As it orbits within the diffuse stellar atmosphere dynamics of the giant, it compresses surrounding dust and pulls at the outer convective shells. An observer stationed close to Betelgeuse would not merely see a bubbling red surface; they would see a companion star skimming through glowing stellar detritus, leaving a persistent wake of incandescent gas across the supergiant's sky.
