(cba:news) BT Mon, finis
jop at astro.columbia.edu
Sat Dec 23 04:19:30 EST 2017
Thanks for all the BT Mon data. With its period so close to 8 hours,
it's not easy to get a full light curve, and in particular to test
securely for the presence of a secondary eclipse. (In an edge-on binary
of LONG Porb, a secondary eclipse is expected.)
I'm not 100% persuaded yet, but a secondary eclipse seems to be absent.
Also, the eclipses are coming very early - a full 0.05 P_orb early
relative to the existing ephemeris. This needs no "persuading"... and
might signify a large period decrease. We'll repeat this next year and
see if that trend holds up (when the drift would grow to 0.06P_orb).
But we're done for the year. Sorry to inflict such a difficult star on
you! Next year it'll be easier, because we'll "know what we're looking
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