Neutrinos give a novel probe to explore deep interior of astrophysical objects , which otherwise is not accessible with optical observations ; among notable examples are solar and supernova neutrinos .
We show that there is a new class of strong neutrino emission from helium burning , ^ { 14 } { N } + \alpha \rightarrow ^ { 18 } { F } + \gamma followed by beta decay ^ { 18 } { F } \rightarrow ^ { 18 } { O } + e ^ { + } + \nu _ { e } , that gives a maximum neutrino luminosity of 10 ^ { 8 } times the solar bolometric luminosity at the helium-core flash of a 1 M _ { \odot } star , whereas the flash is not observable by optical means .
This means that the neutrino flux , of average energy of 0.382Â MeV , will be 10 % the solar CNO neutrino flux on Earth if the star is located at 10pc .