Difference between revisions of "Triggers:Flares"

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* Statistical study of M dwarf flares in Stripe 82 is presented in [http://arxiv.org/abs/0906.2030 Kowalski et al. 2009].
 
* Statistical study of M dwarf flares in Stripe 82 is presented in [http://arxiv.org/abs/0906.2030 Kowalski et al. 2009].
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* Colour range for M-dwarfs (r − i) > 0.53 and (i − z) > 0.3 and (u-r) > 3
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* flares are the most pronounced in u-band
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* around 35% of M-dwarfs are in binary systems - these have bluer u-g. Most single M-dwarfs will have u-g > 1.8
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* g - K > 4
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* amplitude in u > 0.7 mag up to 5 mag.
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* flaring fraction: 0.0108%, i.e. 1 of every 10,000 observation of a M-dwarf in Stripe 82 resulted in a flare
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* 1.3 flares per hour sq.deg with $\Deta u > 0.7$ mag, with slightly more flares towards the galactic plane.
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[[File:FlaresStripe82.png|400px|Ampitude distribution for Stripe82 flares.]]
 
[[File:FlaresStripe82.png|400px|Ampitude distribution for Stripe82 flares.]]
  
 
[[File:Mdwarf_flare_Gl234AB.png|600px]] Example of flares in Gl234AB (V577 Mon) from [http://ukads.nottingham.ac.uk/abs/1989A%26A...208..208D Doyle et al. 1989]
 
[[File:Mdwarf_flare_Gl234AB.png|600px]] Example of flares in Gl234AB (V577 Mon) from [http://ukads.nottingham.ac.uk/abs/1989A%26A...208..208D Doyle et al. 1989]

Revision as of 13:58, 28 July 2009

  • Colour range for M-dwarfs (r − i) > 0.53 and (i − z) > 0.3 and (u-r) > 3
  • flares are the most pronounced in u-band
  • around 35% of M-dwarfs are in binary systems - these have bluer u-g. Most single M-dwarfs will have u-g > 1.8
  • g - K > 4
  • amplitude in u > 0.7 mag up to 5 mag.
  • flaring fraction: 0.0108%, i.e. 1 of every 10,000 observation of a M-dwarf in Stripe 82 resulted in a flare
  • 1.3 flares per hour sq.deg with $\Deta u > 0.7$ mag, with slightly more flares towards the galactic plane.

Ampitude distribution for Stripe82 flares.

Mdwarf flare Gl234AB.png Example of flares in Gl234AB (V577 Mon) from Doyle et al. 1989