[vsnet-alert 5259] NSV08383 outburst

[Taichi Kato <tkato>]

NSV08383 outburst

  As reported by Berto Monard, the dwarf nova NSV 08383 is in outburst.
The present brightness rivals that of the 1999 February - March outburst,
which lasted as least five days.

  YYYYMMDD(UT)   mag  observer
  20000720.540  <152  (A. Pearce)
  20000724.512  <152  (A. Pearce)
  20000813.540  <145  (A. Pearce)
  20000906.719  <143  (B. Monard)
  20000917.716   141  (B. Monard)

  All sorts of observations (including time-resolved photometry) are
urgently requested, as indicated below.

Regards,
Taichi Kato
VSNET Collaboration team

=============================================================================
Past information:

[vsnet-alert 2715]

NSV 08383 in Ara is indicated in the CV atlas rev 1997as 
ug:  13.5p-(15.5p
at pos (2000) 17 16 53 -65 32 42

My visual observation of the variable:

NSV08383   990227.11   142   MLF    no sequence

previous observation

NSV08383   990223.99   <138   MLF

Follow up with UBVRI photometry will confirm the cv nature of this
object.
I found the variable located slightly (40 arcsec) SSW of the indicated
coordinates.

Regards,
Berto Monard
Pretoria

[vsnet-alert 2727]

 Dear VSNET readers,

I have identified NSV 08383 at its outburst position with star
USNO-A2.0 0225-27288943 at location 17 16 52.75 -65 32 47.1 This star
has a quiescent magnitude around 17.3 and B-R=0.7 which indicates the
blue colour of this object when compared to neighbouring stars of that
brightness level at quiescence.
I am confident that NSV08383 is a cv in outburst and not like V2323
Sgr and now recently V2038 Sgr which are non cvs and probable Mira
stars.

It would be very opportune to have this outburst confirmed and
specified by UBVRI (at least blue-red) measurements.

I propose the following comparison stars, calibrated vs a nearby GSPC
sequence, USNO-A2.0 refers:
0225-27292846 at 17 16 59.3 -65 32 17 , mag 143
0225-27286104 at 17 16 48.0 -65 31 36 , mag 139
0225-27277133 at 17 16 33.0 -65 31 42 , mag 147

These sequence stars are sufficiently 'white' to allow proper visual
comparison to bluish NSV 08383.

My recent observations using the above sequence

NSV08383   990223.99   <139   MLF
NSV08383   990227.11   142   MLF
NSV08383   990228.106   141   MLF

Best regards,

Berto Monard
Pretoria

[vsnet-alert 4107]
The suspected dwarf nova NSV 08383 in Ara is currently undergoing an outburst
as detailed below:

Feb 1.819UT  >15.0
Feb 2.799UT  14.7

The Downes and Shara (1997) position for this UG is 17h 16m 53s and -65d 32m
42s.  I believe that the star may be located approximately 7-8" southeast of
this position judging by the observation made last night.

It would be useful for astrometry to be performed during this outburst and
possible spectroscopy to verify the nature of this star.

Regards
Andrew Pearce (PEX)

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