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(cba:news) XMMU J115113.3-623730 (Joe Patterson) [2013-03-30T00:03:46Z]


Hi (southern) CBAers,

Now would be a good time to get long time series on this star. Three years it showed a strong 0.3604 d period, presumably the orbital period. This year, Josch Hambsch has obtained good nightly coverage from Chile, and that signal - so obvious in 2010 - is gone. The star is fainter now - 15 rather than 13.6 - but it's quite puzzling that an orbital signal would disappear. Given the length of the period, it may be because we need help from other longitudes to nail this down, amid the chatter of random variability. Time-series in the next 1-2 weeks should link nicely with the data in hand and resolve this problem.
The comparison star Josch is using is AUID 000-BJV-892 (AAVSO Label 11.3)


joe