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In a very conservative approach, supposing that total heat flow of the Earthis exclusively due to resonant capture inside the Earth of axions, emitted by57-Fe nuclei on Sun, we obtain limit on mass of hadronic axion: m_a<1.8 keV.Taking into account release of heat from decays of 40-K, 232-Th, 238-U insidethe Earth, this estimation could be improved to the value: m_a<1.6 keV. Boththe values are less restrictive than limits set in devoted experiments tosearch for 57-Fe axions (m_a<216-745 eV), but are much better than limitsobtained in experiments with 83-Kr (m_a<5.5 keV) and 7-Li (m_a<13.9-32 keV).

Heat flow of the Earth and resonant capture of solar 57-Fe axions