2025MNRAS.540.3421S

Astrometric microlensing provides a powerful tool for determining the masses of isolated stars. Current predictions for astrometric microlensing events lack the coverage of lens stars with estimated masses between $3$ and $5\, {\rm M}_{\odot }$, even though intermediate-mass stars occupy a critical phase in stellar evolution. In this study, we utilize Gaia DR3 data to search for predicted astrometric microlensing events caused by intermediate-mass stars ($3\, {\rm M}_{\odot }< M_{\mathrm{L}}< 5\, {\rm M}_{\odot }$) during the J2020-J2070 epoch. We ultimately identify 25 candidate events, where 24 events are not reported previously. Nine of the predicted microlensing events are likely associated with red giant lens stars. Notably, one event manifests detectable astrometric deflection ($0.867 \pm 0.194$ mas) and photometric amplification ($\approx 2.85$ mmag), which provides unique constraints on stellar kinematics and lensing geometry.