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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20081030T000000
DTEND;TZID=Atlantic/Canary:20081030T010000
UID:iactalks-179
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/179
CREATED:2008-10-30T00:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Living with a red dwarf: X-ray and UV emissions of red dwarf stars 
 and effects on hosted planets and their suitability for life
DESCRIPTION:Living with a red dwarf: X-ray and UV emissions of red dwarf st
 ars and effects on hosted planets and their suitability for life\nProf. Ed
 ward Guinan\n\nRed Dwarf (dM) stars are the most numerous stars in our Gal
 axy. These faint, cool, long-lived, and low mass stars make up > 80% of al
 l stars in the Universe. Determining the number of red dwarfs with planets
  and assessing planetary habitability (a planet’s potential to develop a
 nd sustain life) are critically important because such studies would indic
 ate how common life is in the universe. Our program - "Living with a Red D
 warf" addresses these questions by investigating the long-term nuclear evo
 lution and magnetic-dynamo coronal and chromospheric X-ray to Ultraviolet 
 properties of red dwarf stars with widely different ages. The major focus 
 of the program is to study the magnetic-dynamo generated X-ray-Ultraviolet
  emissions and flare properties of red dwarf stars from youth to old age. 
 Emphasized are how the stellar X-UV emissions, flares & winds affect hoste
 d planets and impact their habitability. We have developed age-rotation-ac
 tivity relations and also are constructing irradiance tables (X-UV fluxes)
  that can be used to model the effects of X-UV radiation on planetary atmo
 spheres and on possible life on nearby hosted planets. Despite the earlier
  pessimistic view that red dwarfs stars are not suitable for habitable pla
 nets - mainly because their low luminosities require a hosted planet to or
 bit quite close (r 
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