by charlie, katie, collin, justin, and eric
Post on 22-Feb-2016
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BY CHARLIE, KATIE, COLLIN, JUSTIN, AND ERIC
FLARES
A new flare star member candidate in the Pleiades Cluster (Moualla et al.)
This Study
• Initially undertaken to find new low-mass stars, brown dwarfs and variable stars
• In the field chosen no previous survey to find brown dwarfs had been done before.
• One new flare star was found, and it was found to lie on the Pleiades ZAMS.
Flare Stars
• First discovered in 1924• Short increase in brightness• V > 13.3 mag.• Proxima Centauri
Methods/Data Used
Light Curve
In order to find the magnitude of the stars, 3 programs were used.• SE • GAIA• MIDAS
Apparent magnitude in R-band:
R = CR + Rinstr – kR * z
Current Interpretation1) Two candidates for flare.
-Both M class
2) Spectral class and optical extinction: consistent with Pleiades Cluster. -AV1 = 0.231±0.024; AV2 = 0.266±0.020; AVP=0.2 mag
3) Flare time: consistent4) Color-magnitude diagram:
consistent5) Proper motion: currently
inconsistent…
Figures from M. Moualla et al. (2011)
Problems
● It has not yet been determined which of the two stars is the flare star
● Only one flare has been observed so far, so the frequency of flares is not yet known
● It is not known whether the observed flare is typical for this star
● The proper motion hasn't been determined for the individual stars
Solutions
• Observations– Which one?– Flare Star?– Typical?– Proper Motion?
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