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[vsnet-campaign 884] EP Car outburst

EP Car outburst

  The dwarf nova EP Car is undergoing a relatively rare outburst.
The last outburst was observed in 2000 Feb. (mv=14.3).  Time-resolved
photometry was conducted by Gordon Garradd during this outburst,
and modulations simiular to superhumps were observed.  The present
outburst is relativly fainter, and rather unfavorably situated for
a long run, but further time-resolved photometry may be useful in
determining the nature of variations.  We recently observed similar
modulations in some dwarf novae, e.g. V344 Ori, and their nature is
still unclear.

  YYYYMMDD(UT)   mag  observer
  20010412.446  <146  (R. Stubbings)
  20010413.438  <146  (R. Stubbings)
  20010413.549  <140  (P. Nelson)
  20010417.517  <144  (R. Stubbings)
  20010417.560  <140  (P. Nelson)
  20010420.594  <150  (A. Pearce)
  20010424.490  <145  (P. Williams)
  20010425.506  <144  (R. Stubbings)
  20010426.487   148  (R. Stubbings)
  20010426.500   148  (R. Stubbings)
  20010426.551  <150  (A. Pearce)

> [vsnet-alert 4238]
> 
>    Gordon Garradd has provieded the result from the first half of a 6-hour
> time-resolved photometry.  The data seem to indicate the presense of
> 0.1-mag modulation, which might be attibuted to superhumps.  The possible
> period inferred from this segment of data seems to be longer than 0.08 day.
> Further analysis of the data and observations are very promising and
> encouraging!
> 
> [vsnet-alert 4245]
> 
>     The immediately following data by Gordon Garradd mentioned in
> [vsnet-alert 4238] have not convincingly confirmed the recurring nature
> of the hump.  The object brightened again by 0.1 mag at around Feb. 17
> 14 h UT, but remained bright for at least the following two hours.
> The possibility of superhumps with a period shorter than 2 hours can be
> safely precluded, but the possibility for a longer period still remains.
> It should be worth noting no rapidly fading trend was observed during
> the entire run.

Regards,
VSNET Collaboration team

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