Return to Home Page
Re: SDSS J040714.8-064425 > Yes, this star was highlighted in the SDSS Paper II (Szkody et al., > 2003 AJ 126, 1499) with a period of 3.96hr and quiescent eclipse depth > of 1.6mag (see figure 10). I have BV calibration photometry for > the field (as I do for all of the SDSS CVs); since it is in outburst, > I've placed that file at > http://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/sdss0407.dat > I would be suspicious of assuming the modulations are superhumps; > look at the lightcurve in our paper. Having looked at the period and variation, the star looks like an active eclipsing SS Cyg-type dwarf nova, resembling EX Dra with P=0.210 d. (Berto, you will be surprized to see this northern exceptionally bright! counterpart). The eclipsing SS Cyg-type dwarf nova with similar periods (such as U Gem and IP Peg) tend to show similar hump-like features, but the reality of genuine superhumps has not yet been confirmed. I suspect that the SDSS object is an SS Cyg-type star with alternating (with some irregularity) wide and narrow outbursts. Phase 0.5 hump feature with unfiltered photometry is often a reflection effect, be cautious! Regards, Taichi Kato
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
