The extraordinary 1989 December 14/15 optical flare events on V711 Tauri

Details The extraordinary 1989 December 14/15 optical flare events on V711 Tauri The extraordinary 1989 December 14/15 optical flare events on V711 Tauri

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...373l...9h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 373, May 20, 1991, p. L9-L12.

Astronomy and Astrophysics

Astrophysics

17

Astronomical Photometry, Binary Stars, Magnetic Stars, Stellar Flares, Variable Stars, Light Curve, Stellar Luminosity, Taurus Constellation

Scientific paper

Photometry in B and V taken with the Vanderbilt Tennessee State 16 inch (41 cm) robotic telescope confirms the intense broad-band optical continuum flare activity reported by Chinese observers on the active chromosphere binary V711 Tau on December 14/15, 1989. Twelve hours after the flare reported from China, there occurred a separate and more intense flare with B and V amplitudes of 0.69 and 0.42 mag, respectively. These amplitudes correspond to peak flare luminosities of approximately 2 x 10 to the 33rd ergs/s in B and 1 x 10 to the 33rd ergs/s in V. The observed color of its excess light implies that the flaring region covered approximately 8 percent of the surface of the K1 subgiant star on which it erupted. Although the shape of the light curve was unchanged after the flare, the mean brightness of the star was enhanced by 3 percent in B, and it required nearly three months to decay to its preflare mean brightness. This is the first confirmed and, by far, the brightest example of broad-band optical flaring activity on an evolved, magnetically active star more luminous than the sun.

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