(cba:news) IR Com, EX Hya, DW UMa, AY Sex, V1159 Ori
jop at astro.columbia.edu
Mon Apr 7 13:49:05 EDT 2014
Time for a status report on some of our stars.
1. V1159 Ori. We're finished with it for the year.
2. EX Hya. Likewise, Nice tune-up of the ephemerides.
3. AY Sex. Could you resume regular monitoring - to measure the
magnitude, and also, if you can get good data, any variability
(flickering?). We have an HST observation later in April.
4. DW UMa. Great result, as Enrique advertised! Simultaneous positive
and negative superhumps, with the eclipse shape varying as a function
of... well, precession phase, but since there are presumably TWO types
of precession, we need to distinguish sharply between the two. This
merits a couple more weeks of data, especially by us norteamericanos
(the Spaniards are going great guns on it).
5. IR Com. As some of you know, the credentials of this alleged dwarf
nova are somewhat in doubt, because it hardly ever erupts. It would be
a lot more pleasant if the star were magnetic - either an AM Her or DQ
Her star. So... #1, get occasional snapshots of the star to see its
luminosity state (and warning, it has deep eclipses)... and #2, if you
have good signal-to-noise at 17.0, get some time series to test for a
fast periodic signal.
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