Some results of the cooperative photometric observations of the UV Cet-type flare stars in the years 1967 71

Details Some results of the cooperative photometric observations of the UV Cet-type flare stars in the years 1967 71 Some results of the cooperative photometric observations of the UV Cet-type flare stars in the years 1967 71

Nov 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972ap%26ss..19...75g&link_type=abstract

Astrophysics and Space Science, Volume 19, Issue 1, pp.75-92

Astronomy and Astrophysics

Astrophysics

63

Scientific paper

The list of the cooperative photometric observations of the UV Cet-type flare stars that have been organized during the years 1967 to 1971 by the Working Group on Flare Stars of the IAU Commission 27 is given. The completeness and reliability of the data obtained are evaluated by comparing simultaneous observations at different observatories. the statistical analysis of the UV Cet, YZ CMi, EV Lac and AD Leo flares observed in the B-band is carried out. The flare energy spectrum in the energy range where observational selection effects are small is found to be d lnv/d lnE B=-1.4 to -1.9,v is an occurrence of flares with radiation energy ofE B. The total flares' radiation is equal to 1.7%, 1.2%, 0.3% and 0.4% of the quiet radiation in the B-band of the stars listed, and the main part of this total radiation is due to the strongest flares. Distributions of flare rise times (t r) and of rates of flare absolute luminosity increase (d2 E B/dt r 2≡Ë r) are considered; these parameters of flare are independent statistically for all stars studied. Correlation coefficientsr (E B,t r) andr (E B,r(E B,Ë r)) are rather small except r (E B,t r)=0.86 for the AD Leo flares. Contradictory conclusions on temporal distribution of flares infered by different investigators are noted.

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