[vsnet-alert 21601] Re: DDE 76 supercycle
hambsch at telenet.be
Sun Nov 19 22:34:03 JST 2017
I have taken a time series of DDE76 last night.
Data are sent for further analysis to Kato et al.
From: vsnet-alert [mailto:vsnet-alert-bounces at ooruri.kusastro.kyoto-u.ac.jp] On Behalf Of Denis Denisenko
Sent: Sonntag, 19. November 2017 13:30
To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp
Subject: [vsnet-alert 21600] DDE 76 supercycle
Rod Stubbings has reported the recent activity of this dwarf nova in Pictor with unkonwn orbital period.
DDE 76 = 1RXS J052113.4-520311
20171111.512 140 Stu.RASNZ
20171113.510 155 Stu.RASNZ
20171118.537 140 Stu.RASNZ
Archival light curve from ASAS-SN (Shappee et al., 2014; Kochanek et al., 2017):
It shows several superoutbursts with an average interval 145 days between them. Maxima detected by ASAS-SN:
2456934.81506 13.685 ASAS-SN
2457080.55822 13.586 ASAS-SN
2457223.92781 13.649 ASAS-SN
2457378.64750 13.457 ASAS-SN
Superoutburst around JD=2457530 was missed due to the seasonal gap.
2457680.85136 13.575 ASAS-SN
2457829.58150 13.354 ASAS-SN
2457951.94554 13.522 ASAS-SN
Best covered superoutburst at JD=2457829 was showing 0.1 mag/day fading rate over 10 days.
Since the supercycle varies between 122 and 155 days, the next superoutburst should occur anytime around JD=2458076 and JD=2458100 (Nov. 18 - Dec. 12) or may have already started. Probably Nov. 11 detection at 14.0m was a precursor. Usually normal outbursts in ASAS-SN data were no brighter than 14.4-14.5m with a couple exceptions at 14.0m.
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