(cba:news) SS UMi, YY Dra, YY Sex
jop at astro.columbia.edu
Mon May 6 08:19:12 EDT 2013
A few other stars to clarify their status. Enrique has started up the
SS UMi season, and for northerners, strangely enough, the star is in
excellent position for observation. The star is now around 17th and
showing a strong periodic signal, and likely more than one. Just our
cup o' tea... but we greatly need coverage at USA longitudes to
unambiguously define the period structure. This star may give trouble
since it's a frequent erupter... but I think it's probably interesting
enough to declare all-out war (coverage at all luminosity states). But
FOR SURE it's a great target at 17th magnitude - and get a LONG time series.
Time to bury YY Sex. Very entertaining star, with huge humps,
especially in I light. But the period is rock-stable, and there is no
second period as asserted in the literature. Nor is it a reflection
effect, as also stated in the only publication on the star. Just a
garden-variety AM Herculis star. But we have some great data, and it'll
be a cute little paper.
Also time to bury YY Dra. The coverage, especially by Enrique, Jim
Jones, and David Cejudo, has been good; but the detections of the fast
period signals (9 and 4.5 minutes) have been *borderline*, and that's
not sufficiently convincing when there are FOUR candidate signals (w,
w-w_orb, 2w, 2w-2w_orb).
Is anyone (in the CBA orbit) planning to go to the SAS conference in Big
Bear this year? We usually go, but won't this year, mainly because of a
Kitt Peak observing run coinciding exactly with the dates. The program
seemed low on variable stars, and very low on CVs. We'll make a big
push for next year, though. Meanwhile, is anyone planning to go? I'd
like to announce here, to help you guys, if any, find each other.
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