(cba:news) more on AY Sex
jop at astro.columbia.edu
Thu Apr 24 16:31:22 EDT 2014
BTW I sent incorrect coordinates. 38, not 48! So the correct
coordinates are 10 23 47.687 +00 38 41.15. Whew.
Best to observe unfiltered, since it's the activity level we want to
study (and compare with other wavelengths). But a few integrations in V
light would also be good, to establish the star's calibrated V
magnitude. Usually a good general rule, by the way.
From the light curves I sent, note there seems to be a pattern of a
slow sinusoidal wave - perhaps the result of the heated secondary - plus
"positive flickering" (only upward excursions from the 4.8 hour orbital
wave). The latter is alleged to be from the rapidly spinning neutron
star. Let's see if this explanation holds up.
When you know the approximate V brightness, send it in! HST, or a gang
of humans running it, is always nervous about these active binaries
frying their detector.
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