Difference between revisions of "Triggers:Flares"

Revision as of 12:58, 28 July 2009

Statistical study of M dwarf flares in Stripe 82 is presented in Kowalski et al. 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.

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

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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].
+* 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.
 [[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]