UBV photometric study of the extra large flare of HR 1099

Details UBV photometric study of the extra large flare of HR 1099 UBV photometric study of the extra large flare of HR 1099

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994cha%26a..18...76z&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 18, Issue 1, p. 76-84.

Astronomy and Astrophysics

Astrophysics

Rs Cvn Binaries, White Light Flares

Scientific paper

This paper presents observation and analysis of the extraordinarily energetic white-light flare of the solar-like active binary HR1099 (=V 711 Tau) on 1989 December 14. The flare luminosities in U, B, V were found to be 3.00, 6.49, 3.44 × l032erg/s, respectively, and the total flare energy in the optical region, to be greater than 1037 erg. The colour indices of the pure flare radiation near the maximum phase were (B - V)ƒ; = 0.35, (U - B)ƒ; = -0.65, similar to events in classical flare stars. Under the assumption of quasi black body radiation the flare area was found to be about 3% of the apparent disk of the K1 IV component star, and the maximum temperature, 7000-8000 K. This event shows that it is possible for active subgiants more massive than the sun to produce super luminous white light flares, and provides an important datum in the study of the chromospheric activity of such stars.

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