(cba:news) V455 And and HS2219+1824

Joe Patterson jop at astro.columbia.edu
Wed Aug 26 12:24:33 EDT 2009

Further to Bob and Etienne's cba-chat...

V455 And has periodic signals on timescales from 34 s to 3.5 hours. 
Most of them are reliable, others wander a bit... and except for the 
orbital period, I'd say they are all still of unknown origin.  (In fact, 
I don't think Porb is 100.00% nailed either - but awfully close.)  A few 
CBAers might be able to resolve that fast period, but most should 
probably settle for the 30-60 s time resolution that this magnitude (16) 
probably permits.  That will bring everything into play except the fast 
signal; we'll try to resolve the latter with some bigger-scope data.

Just a touch earlier in the night, it's time to jump on HS2219+1824... 
which Gianluca Masi has found to be flashing waves that look awfully 
like superhumps.  This one won't be with us long!


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