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(cba:news) FO Aqr, done; AO Psc, let it begin (Joe Patterson) [2016-08-16T22:10:09Z]


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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