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2025 Charles Lillo 2025 Charles Lillo

Bipolar Hα Jets of KX Andromedae

KX Andromedae displays a striking pair of collimated Hα jets driven by a dynamic mass-transfer process within this interacting binary system. Material from the secondary star overflows its Roche lobe and accretes onto the Be star, where it forms a dense circumstellar environment. As this material builds up, it is expelled perpendicular to the orbital plane in two opposing directions, forming the long, filamentary outflows seen here. The vivid reds trace ionized hydrogen, while the bluish knots reveal regions of shock-excited gas sculpted by the jet’s passage through the surrounding interstellar medium.

The Be star likely provides the ultraviolet radiation responsible for ionizing the jets, giving them their distinct Hα glow. Against a rich star field and faint dust, the structure stretches across the frame like a cosmic spear, showcasing the powerful consequences of stellar interaction. This view highlights a rare opportunity to witness stellar mass transfer in action, captured as a luminous, finely sculpted bipolar outflow.

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