  We study the properties of strange quark stars by employing a 3-flavor
Nambu-Jona-Lasinio model with both scalar-isovector and vector-isovector
interactions. Using the constraint on the vector-isoscalar interaction strength
obtained from the elliptic flow splitting between particles and their
antiparticles in relativistic heavy-ion collisions, we investigate the
dependence of the properties of strange quark stars on the vector-isovector and
the scalar-isovector interactions, and compare the results with the
state-of-art astrophysical constraints on the compact star radius and mass as
well as its tidal deformability from the GW170817 event. Results from our study
reinforce the prospect of using both heavy-ion collisions and astrophysical
observations to provide constraints on the isovector coupling strength in quark
matter and thus the quark matter equation of state as well as the QCD phase
structure at finite isospin chemical potentials.
