  We investigate the tidal deformability of spherically symmetric axion stars
on the stable branches, including the Newtonian and relativistic branches. The
results suggest that on the stable branch, the electric Love numbers of axion
star are positive, while the magnetic Love numbers are negative. On the
Newtonian stable branch, the electric tidal Love numbers are much larger than
the magnetic ones, while on the relativistic stable branch, they are slightly
larger. Furthermore, the relativistic stable branch has much smaller tidal Love
numbers than the Newtonian stable branch, indicating weaker deformability of
axion stars on the relativistic stable branch. This could be attributed to the
fact that on the relativistic branch, axion stars are more compact, resulting
hardly distorted by tidal forces.
