Living with a Red Dwarf: FUV and X-ray emissions of dM stars and effects on hosted Planets - Astrophysics > Solar and Stellar AstrophysicsReportar como inadecuado




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Abstract: Red Dwarf dM stars are overwhelmingly the most numerous stars in ourGalaxy. These cool, faint and low mass stars make up more than 80% of allstars. Also dM stars have extremely long life times longer than 50-100 Gyr.Determining the number of red dwarfs with planets and assessing planetaryhabitability a planet-s potential to develop and sustain life is criticallyimportant because such studies would indicate how common life is in theuniverse. Our program -Living with a Red Dwarf- addresses these questionsby investigating the long-term nuclear evolution and the coronal andchromospheric properties of red dwarf stars with widely different ages ~50 Myr- 12 Gyr. One major focus of the program is to study the magnetic-dynamogenerated coronal and chromospheric X-ray-FUV-UV emissions and flareproperties of a sample of dM0-5 stars. Observations carried out by FUSE of anumber of young to old dM stars provide important data for understandingtransition region heating in these stars with deep convective zones as well asproviding measures of FUV irradiances. Also studied are the effects ofX-ray-FUV emissions on possible hosted planets and impacts of this radiationon their habitability. Using these data we are constructing irradiance tablesX-UV irradiances that can be used to model the effects of XUV radiation onplanetary atmospheres and possible life on planetary surfaces. The initialresults of this program are discussed.



Autor: Scott G. Engle, Edward F. Guinan, Trisha Mizusawa

Fuente: https://arxiv.org/







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