There is a group of three objects of this kind, HS0139+0559, and HS0229+8016, and HS0642+5049. Finding out their true nature would be a nice project.
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This is one of the systems where long-term monitoring is absolutely
crucial to determine the true CV subtype. We have obtained
spectroscopy and photometry on a number of occasions, and it looked
most of the times like a UX UMa star, i.e. with a hot thick disc
spectrum. On one occasion we found it a little fainter than usual, and
the emission lines were more pronounced. The best guess is that it is
either a UX UMa novalike or a Z Cam dwarf nova that we observed mostly
during standstills. Moderate orbital photometric variability, and
a nice sinusoidal radial velocity curve with a period of 233min.
Monitoring is necessary to tell whether this is indeed a
novalike, which is always bright (and, possibly does show some deep low
states, as the VY Scl stars), or if it is a Z Cam dwarf nova which we
just happened to observe always in outburst or standstill.
There is a group of three objects of this kind, HS0139+0559, and HS0229+8016, and HS0642+5049. Finding out their true nature would be a nice project. |
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