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Electron-positron annihilation line from a Galactic center direction wasdiscovered by the balloon-borne germanium gamma-ray telescope, and confirmed byOSSE experiment of CGRO mission. Extensive observations by INTEGRAL observatorypermit to determine properties of the annihilation line from Galactic bulge.Possible sources of $e^{+}$ already discussed are supernovae explosions,microquasars, gamma-ray bursts, tidal disruption events, activity near blackhole of Sgr A*, $e^{+}$ generation by subrelativistic cosmic rays, or even darkmatter. One remarkable feature of the line emission is an absence of resolvedpoint like sources. Any model should take into account this feature. Weconsider flares of low-mass stars as a possible cumulative $e^{+}$ source ofthe observed annihilation line from the bulge. Our estimations show that$e^{+}$ production by numerous flaring stars in Galaxy bulge can besignificant, or even the main source of $e^{+}$ responsible for theannihilation line observed from the central part of our Galaxy.

Can flaring stars explain the annihilation line from the Galaxy bulge?