Astrobiology in the Environments of Main-Sequence Stars: Effects of Photospheric Radiation

摘要

We explore if carbon-based macromolecules (such as DNA) in the environments of stars other than the Sun are able to survive the effects of pho-tospheric stellar radiation, such as UV-C. Therefore, we focus on main-sequence stars of spectral types F, G, K, and M. Emphasis is placed on investigating the radiative environment in the stellar habitable zones. Stellar habitable zones are relevant to astrobiology because they constitute circumstellar regions in which a planet of suitable size can maintain surface temperatures for water to exist in fluid form, thus increasing the likelihood of Earth-type life.