DASCH Photometry Of KU Cygni: An 8-yr Dimming Around 1900

Details DASCH Photometry Of KU Cygni: An 8-yr Dimming Around 1900 DASCH Photometry Of KU Cygni: An 8-yr Dimming Around 1900

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812103t&link_type=abstract

American Astronomical Society, AAS Meeting #218, #121.03; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

KU Cygni is an Algol-type eclipsing binary consisted of a F-type main sequence star (gainer) with a large accretion disk, and a K5III red giant (donor). Here we present the discovery of an 8-yr dimming begining in 1895 found from its 100 yr DASCH light curve. It showed a 0.7 mag slow dimming from 1895 to 1903, and then quickly brightened back to normal state in 1903. After 1903, KU Cygni was stable within 0.2 mag in non-eclipsing phases when our data are available (i.e. 1909-1952 and 1962-1990). The dimming event is probably caused by increases in dust extinction surrounding the gainer, and the quick brightening could be due to the evaporation of dust transported inwards through the disk surrounding the gainer. The dust excess during the dimming event might arise from clumps of dusty gas ejected from the red giant donor.

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