IX Dra : New ER UMa-type dwarf nova

R. Ishioka, the Kyoto team, reported an outburst (~15mag) of IX Dra on April 13 (vsnet-campaign 851). The light curve showed clear superhumps with a period of 0.068 d. Combined with previous observations, this seem to confirm the suggestion as a new ER UMa star or a closely related system (vsnet-campaign 854). An additional run on April 14 and 15 also shows superhumps, and the combined data showed 0.6697 d period (vsnet-campaign-dn 665).

An Observation on May 2 by M. Reszelski indicates another outburst at 14.9mag (vsnet-campaign-dn 744). This outburst was confirmed on May 3 and rapidly faded on May 4 (vsnet-campaign-dn 754). After similar short outbursts were reported on May 11 (vsnet-campaign-dn 766), and May 14 (vsnet-campaign-dn 785), the next superoutburst occurred on May 19 as reported by G. Poyner and M. Reszelski (vsnet-campaign-dn 798). The supercycle of the object is thus about 36 days (vsnet-campaign 926). The possible superoutburst finished on May 25 when M. Uemura reported the faint (17.1mag) magnitude (vsnet-campaign-dn 827).

Outbursts reaching 15th mag were then reported on May 25 (vsnet-campaign-dn 858), May 30 (vsnet-campaign-dn 863), June 3 (vsnet-campaign-dn 876). A brighter outburst was then detected, and its long duration nature was confirmed by the Kyoto team on June 11. This established that IX Dra is a new member of ER UMa stars (vsnet-campaign 972).

Three fainter outbursts were reported by M. Reszelski until August 1 when relatively bright outburst at 14.6mag was detected. (vsnet-campaign-dn 950, 979, 993, 1079). And then, faint outbursts are reported on August 9 (vsnet-campaign-dn 1161), 15 (vsnet-campaign-dn 1256), 26 (vsnet-campaign-dn 1381), September 8 (vsnet-campaign-dn 1527), 19 (vsnet-campaign-dn 1599), October 13 (vsnet-campaign-dn 1723)

As reported by Pavol A. Dubovsky on November 17, the object experienced a bright outburst (14.6mag) (vsnet-campaign-dn 1912). The outburst lasted long, indicating it was a superoutburst (vsnet-campaign-dn 1937).

Other related articles: vsnet-campaign-dn 653, 677, 1916, 1924

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