HD 15115 is a yellow-white star.

The asymmetric disk encircling the star was discovered using the Hubble Space Telescope

Hubble Space Telescope

The Hubble Space Telescope is a space telescope that was carried into orbit by a Space Shuttle in 1990 and remains in operation. A 2.4 meter aperture telescope in low Earth orbit, Hubble's four main instruments observe in the near ultraviolet, visible, and near infrared...

 and further investigated by the W.M. Keck Observatory.

The reason for the asymmetry is thought to be the gravitational pull of a companion star, an exoplanet, or interaction with the local Interstellar Medium.