(cba:news) HU Aquarii, a new campaign target
jop at astro.columbia.edu
Wed Aug 8 07:12:35 EDT 2018
We're likely to have a hard X-ray (NUSTAR) observation of this star on
August 17, and may have some Swift coverage before then also. Now's a
good time to start time -series observations. The star is around 16.0,
with very deep eclipses. Hence probably an unfiltered target for most
of us. Someone, though, should try V (Gordon?), since these AM Her
stars have very weird colors. Meaning: inferring V from "unfiltered"
magnitudes is pretty uncertain. In fact, come to think of it, everyone
should consider taking some time to establish that relationship for
In Aquarius, thus an equal-opportunity target, plus transiting around
midnight. Let's get the program going in the next few nights - it'll
also give us good baseline, plus some fallback insurance if August 17
weather goes bad.
Recent interest in this star has been spurred by the relatively large
variations in mid-eclipse timing - you know, planets, etc. So I guess
that's another reason to observe this guy. But even if the planetary
hypothesis goes pfffft (most do), there's still some pretty big wiggles
in O-C, to be explained by some other astrophysical tool. Maybe
something related to the physics of CVs? Hey, just a suggestion!
But... don't forget Maxie either... or VW Hyi (campaign still going for
another ~2 days)!
*Don't go crazy with this, though. It's just to get some idea. Since
comparison stars don't have "unfiltered" magnitudes, it's in principle
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