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[vsnet-alert 5779] RX Cha outburst!

RX Cha outburst!

  Rod Stubbing reports that the dwarf nova RX Cha is undergoing a relatively
rare outburst.  Photometry by Gordon Garradd on the occasion of the
1998 Sep. outburst revealed the presence of superhumps, qualifying the
object as a likely SU UMa star.  However, the superhump period has not yet
been determined precisely, nor further confirmatory observations were
obtained.

  Previous outbursts of RX Cha occurred in 1998 January (single positive
observation), 1998 September (long outburst), 1999 December - 2000 January
(long outburst, vsnet-alert 3917).  Assuming a stable cycle length,
the present outburst may be a good candidate for a superoutburst.

  Being at favorable location, further (intensive) time-resolved photometry
is strongly requested.

from [vsnet-alert 2255]

>    An analysis of time-series CCD photometry of RX Cha on Sep. 16
> (vsnet-obs 16007,
>   http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/obs16000/msg00007.html
>  vsnet-obs 16008,
>   http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/obs16000/msg00008.html)
> 
>   has yielded a 0.2-mag modulation suggesting the presence of superhumps.
> The likely period is 0.08 d.  Together with the large outburst amplitude
> (the astrometry by Garradd has confirmed that the object is below the limit
> of USNO catalog in quiescence), the present observation strongly suggests
> that RX Cha belongs to the SU UMa-type subclass of dwarf novae.
> 
> Regards,
> Taichi Kato and Gordon Garradd

  This object is another very promising target for the VSNET Collaboration
project.

  YYYYMMDD(UT)   mag  observer
  20010226.792  <154  (A. Pearce)
  20010227.810  <152  (A. Pearce)
  20010228.469  <144  (R. Stubbings)
  20010301.517  <144  (R. Stubbings)
  20010302.508  <144  (R. Stubbings)
  20010302.799  <153  (A. Pearce)
  20010303.549  <146  (A. Pearce)
  20010304.482  <140  (R. Stubbings)
  20010304.797  <152  (A. Pearce)
  20010305.785  <152  (A. Pearce)
  20010306.719  <144  (R. Stubbings)
  20010310.612  <144  (A. Pearce)
  20010311.569  <144  (A. Pearce)
  20010313.435   143  (R. Stubbings)
  20010313.462   143  (R. Stubbings)

Regards,
VSNET Collaboration team

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