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(cba:news) BT Mon, finis (Joe Patterson) [2017-12-23T09:19:39Z]


Hi CBAers,

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 for"*.

joe p

*Ha!
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