  We study a spin-1 single flavor color superconducting phase which results
from a color-spin locking (CSL) interaction in two-flavor quark matter. This
phase is particularly interesting for compact star cooling applications since
the CSL phase may survive under charge neutrality constraints implying a
mismatch between up- and down-quark chemical potentials which can destroy the
scalar diquark condensate. CSL gaps are evaluated within an NJL model and they
are found to be consistent with cooling phenomenology if a density dependent
coupling constant is used.
