
CHARA Interferometer Uncovers Hidden Twin Stars in Alpha Piscium
Astronomers have achieved the first successful on-sky demonstration of dual-field interferometry at the Center for High Angular Resolution Astronomy (CHARA) Array, using the ultra-high-resolution technique to resolve a long-suspected stellar twin in the Alpha Piscium system.
For decades, astronomers suspected that the bright star system Alpha Piscium, a prominent multi-star system in the constellation Pisces, was hiding a secret. While telescope observations showed two main stellar components (A and B) orbiting one another, spectral data suggested that the star B might be in fact an elusive tight pair of near-identical twins.
Now, an international team of researchers led by Narsireddy Anugu of the Georgia State University (GSU) has announced a real breakthrough in optical astronomy: the first on-sky demonstration of dual-field interferometry at GSU’s CHARA Array. Using this ultra-high-resolution technique, the team successfully resolved the hidden Ba-Bb subsystem, confirming the existence of the close-orbiting twin stars and calculating their physical properties with unprecedented precision.