Thermodynamics of thermal radiation from stars photoautotrophs and biospheres

Details Thermodynamics of thermal radiation from stars photoautotrophs and biospheres Thermodynamics of thermal radiation from stars photoautotrophs and biospheres

Sep 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973slsci...4..469r&link_type=abstract

Space Life Sciences, Volume 4, Issue 3-4, pp. 469-489

Mathematics

Logic

1

Scientific paper

Photoautotrophs are almost the exclusive providers of chemical free energy to the Earth biosphere. Their importance in coadjuvating the evolutionary development of higher forms of life in other planets is briefly discussed from this point of view. A simple analysis based on the nonequilibrium thermodynamics of thermal radiation fields is performed. The analysis relates well known standard parameters of stars of the main sequence to the thermodynamic bounds on the free energy acquisition of planetary photosynthetic processes activated by the star radiation. Upper bounds to permissible wavelengths, active in photosynthesis easily follow. Simple inferences can then be made about the possible types of main sequence stars with planetary systems where exobiological photoautotrophs might have evolved. As red dwarves constitute both the great majority of companions to the Sun and the majority of main sequence stars in our Galaxy, emphasis is placed on discussing the case of planetary systems of stars with low photospheric temperatures. Bounds to the free energy intake per unit area by the biospheres of planets in planetary systems of late type main sequence stars are estimated and compared. Some simple conclusions are drawn.

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