Stellar mass loss can also occur when a star gradually loses material to a binary companion or into interstellar space.

And how about in relation to the possibility of a binary companion, such as the theoretical Tyche?

The binary companion was confirmed in 2007 and determined to be of spectral type K8.5-M1.5 with a mass 59% that of the sun.

Recent results remain inconclusive, but do support the marginal Hipparcos detection of a binary companion.

The nebula has a prominent two-lobed shape, possibly due to a binary companion or magnetic fields.

None of these stars rotate particularly fast, have close binary companions, or are very young.

A good example of true binary companions is the 90 Antiope system.

Gravitational time dilation due to binary companions and Solar system bodies.

Super soft X-rays are believed to be produced by steady nuclear fusion on a white dwarf's surface of material pulled from a binary companion.

These are focused into cones of gas by magnetic fields or a binary companion in a process that is not yet well understood.