Flare Stars and Rapid Irregular Variables in the Southern Coalsack

Details Flare Stars and Rapid Irregular Variables in the Southern Coalsack Flare Stars and Rapid Irregular Variables in the Southern Coalsack

Dec 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972bott....6..179a&link_type=abstract

Boletín de los Observatorios de Tonantzintla y Tacubaya Vol. 6, pp. 179-195 (1972) (http://www.astroscu.unam.mx/~bott/)

Astronomy and Astrophysics

Astronomy

3

Galaxy: Open Clusters And Associations: Individual (Southern Coalsack), Stars: Flare

Scientific paper

A series of multiple-exposure ultraviolet plates in the Southern Coalsack has revealed 140 stars showing rapid variations in brightness on a time scale of 10 to 40 minutes. Although flare-like outbursts were observed in the majority of these objects, a rapid disminution in brightness sometimes takes place more suggestive of rapid irregular variability. The objects are between U = 14 and 17 with estimated amplitudes of 0.5 to 2 magnitudes. Five stars have shown repeated activity. The detection rate is high, 2 to 3 events per hour per square degree for multiple 10 minute exposures reaching limiting magnitude U = 17.

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