(cba:news) FO Aqr, done; AO Psc, let it begin
jop at astro.columbia.edu
Tue Aug 16 18:10:03 EDT 2016
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).
Center for Backyard Astrophysics (CBA) mailing lists
More information about the cba-public