Original Article

Astrophysics and Space Science

, Volume 325, Issue 1, pp 25-30

Habitable zones and UV habitable zones around host stars

  • Jianpo GuoAffiliated withNational Astronomical Observatories/Yunnan Observatory, Chinese Academy of SciencesGraduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences Email author 
  • , Fenghui ZhangAffiliated withNational Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences
  • , Xianfei ZhangAffiliated withNational Astronomical Observatories/Yunnan Observatory, Chinese Academy of SciencesGraduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences
  • , Zhanwen HanAffiliated withNational Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences

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Abstract

Ultraviolet radiation is a double-edged sword to life. If it is too strong, the terrestrial biological systems will be damaged. And if it is too weak, the synthesis of many biochemical compounds cannot go along. We try to obtain the continuous ultraviolet habitable zones, and compare the ultraviolet habitable zones with the habitable zones of host stars. Using the boundary ultraviolet radiation of ultraviolet habitable zone, we calculate the ultraviolet habitable zones of host stars with masses from 0.08 to 4.00 M . For the host stars with effective temperatures lower than 4,600 K, the ultraviolet habitable zones are closer than the habitable zones. For the host stars with effective temperatures higher than 7,137 K, the ultraviolet habitable zones are farther than the habitable zones. For a hot subdwarf as a host star, the distance of the ultraviolet habitable zone is about ten times more than that of the habitable zone, which is not suitable for the existence of life.

Ultraviolet: stars Stars: subdwarfs Astrobiology