(cba:news) CR Boo!
jop at astro.columbia.edu
Wed Mar 28 08:04:57 EDT 2012
Josch Hambsch's observation revealed CR Boo at 17.5 last night. We've
been waiting for this! Since it's equatorial and transiting near
midnight, the star is pretty well placed for everyone - and it would be
awfully nice to jump on this bashful star and obtain time series before
it leaves this rare low state. The relevant period is ~25 minutes, but
there's not much known about what will show up... so probably you can
afford longish integrations - but not too long. Most people should
observe unfiltered, but if you have a (relatively) big telescope and
very good night, some filtered photometry.
And if you have any opportunity to obtain spectroscopy (on a 1+ m
telescope), do it! The only time we ever caught CR Boo faint, we
obtained a super-strange spectrum - it looked like a G star with
helium-2 emission. That's strange enough to be a good candidate for a
mistake; but we thought hard about it, and couldn't figure out any
mistake we made.
We haven't been watching *extremely* closely... but for me, it's been a
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