(cba:news) FO Aqr, done; AO Psc, let it begin

Joe Patterson jop at astro.columbia.edu
Tue Aug 16 18:10:03 EDT 2016


Dear CBAers,

Great, great effort on FO Aqr - which has gone slightly faint this year. 
  I've finished with the timing analysis, with the cycle count firmly 
established all the way back to discovery (1981).  Gotta love that 
amplitude!  But it's time to stop... unless the star fades a lot more.

In October/November, let's re-visit the star to increase the accuracy of 
the period.  This'll test the question: does the rate of period decrease 
track the accretion rate?  (It should, according to theory.)  Because a 
white dwarf's moment of inertia is so high - compared to a neutron star, 
anyway - it takes a while for the period change (of order miliseconds) 
to manifest itself.

But it's a great time to get going on AO Psc - transiting pretty close 
to local midnight, and available to all hemispheres.

V2069 Cyg remains good, as does V2306 Cyg (but for the latter,watch out 
for the field).

joe p
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