TT Boo is a campaign star for CBA. Since the star is well placed in the later evening from our station, we've been following it as time permits.
Cataclysmic variables exhibit rapid brightness variations. The rapidity is well shown in the preliminary reduction of a few hour's observing below, although the amplitude at the time of these observations was not large.
TT Boo is so faint at minimum that it barely appears on the POSS, and is invisible on the RealSky image:
When in outburst, however, the star is glaring on a five minute CCD image with a small telescope:
(The 933 image has been resampled upwards to achieve approximately the same scale as the RealSky image, and therefore looks somewhat out of focus to us. The unaltered image is in pretty good focus.)
The graph below represents the observed brightness variation of TT Boo over a few hours period on a single night. The lines represent delta magnitudes computed by
The blue line is the TT Boo series, while the red line hugging zero is the check star. There are two significant limitations to this very preliminary data:
