Orion Flare Stars: Three Decades of Activity

Details Orion Flare Stars: Three Decades of Activity Orion Flare Stars: Three Decades of Activity

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996iraj...23..183p&link_type=abstract

Irish Astronomical Journal, 1996, 23(2), 183

Statistics

2

Scientific paper

Using all available observational data the total number of flare stars in the region of the Orion OB1 association is newly estimated. The statistically derived total is 1465 flare stars, a little more than estimated ten years earlier i.e. 1200. From an investigation of the stars with a high frequency of flares it was found that in Orion their frequency distribution differs little from the mean frequency distribution of the whole Orion aggregate of flare stars. Comparing with the Pleiades, an older aggregate, for which there is a known difference between similarly grouped data, we suggest that the frequency distributions are different on account of the age differences of the two aggregates. The statistics for Orion were also utilized to test for possible cyclicity. We found only marginal evidence of non-Poissonian behaviour when comparing the earlier with the later observations, contrary to that found in the Pleiades. This may also be evidence of the age difference, and possibly reflects the increasing importance of convective envelopes in the older stars.

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