Presentation on theme: "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."— Presentation transcript:
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 = C R + R instr – k R * z
Current Interpretation 1)Two candidates for flare. -Both M class 2)Spectral class and optical extinction: consistent with Pleiades Cluster. -A V1 = 0.231±0.024; A V2 = 0.266±0.020; A VP =0.2 mag 3)Flare time: consistent 4)Color-magnitude diagram: consistent 5)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
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