A Red Giant’s 55-Day Pulse May Betray Its Hidden Partner
An 80-year light record reveals a red giant’s 55-day pulse in near lockstep with its yearlong cycle, hinting at an unseen companion.
binary stars
How a Pulsating Star’s Clock Revealed a Massive Hidden Companion
A star’s rhythmic pulses reveal an unseen companion’s mass, while clues leave open whether it is a compact remnant or a hidden pair.