[vsnet-campaign-news 303] VSNET Weekly Campaign Summary

[Makoto Uemura]

VSNET Weekly Campaign Summary

*** Headlines ***

New dwarf nova! SU UMa-type? ----- ASAS 023322-1047.0
Very hot gas from an unknown-type object! ----- NSV 19448
Strange light curve! ----- Nova LMC 2005

*** Last week news ***

(new targets) 
  ASAS 023322-1047.0    (RA = 02h33m21s.41, Dec = -10d47'04".09)

    B. Pilecki reported the discovery of a possible nova/dwarf nova 
  by the ASAS3V system.  The object was first detected at V=12.08 on
  an image taken on Jan 20, and it was faint on Jan 18.  It is also
  visible on Jan 19 by ASAS3I instrument (I filter).  One USNO B1.0 
  star (b1=18.18) is located close to the object (vsnet-alert 8801).  
  If the faint USNO B1.0 star is its quiescent counterpart, the
  outburst amplitude is >6-7 magnitude.  D. Nogami commented that 
  it may be a dwarf nova with a large outburst amplitude because
  this star is located far from the galactic plane 
  (vsnet-campaign 1638).  The position of the object, shown above, was
  measured by D. Rodriguez and reported to CVNET (vsnet-alert 8801). 
    H. E. Bond reported their results of spectroscopic observations
  with the SMARTS 1.5-m telescope.  The spectrum (Jan 22) shows broad,
  shallow absorption lines of the hydrogen Balmer series and He I 
  4471A, which is a spectrum typical of a dwarf nova at maximum light
  (vsnet-campaign 1639).
    B. Monard performed time-series photometry, and found an indication
  of hump growth towards the end of the run (vsnet-alert 8809).


  FQ Mon                (RA = 07h16m41s.28, Dec = -06d56'48".4)

    H. Maehara reported an outburst of FQ Mon at V=14.68 on Jan 18 
  (vsnet-outburst 8796).  K. Kubota commented that the reported
  magnitude indicates a superoutburst (vsnet-alert 8796).  In the
  light curve taken by H. Maehara on Jan 18, superhumps were actually 
  detected with an amplitude of 0.2 mag (vsnet-alert 8798).


  V854 Cen              (RA = 14h34m49s.8, Dec = -39d33'18")

    P. Williams reported a fading of the RCB star, V854 Cen.  He also
  reported that the current event appears to have commenced earlier
  this month, according to the ASAS3 light curve (vsnet-alert 8799).


(old targets)
  NSV 19448             (RA = 12h39m07.89s Dec = -45d33'44".2)

    H. E. Bond performed spectroscopy of this poorly-studied object 
  with the SMARTS 1.5m telescope.  They found He II 4686 A emission 
  superposed on the F2 V spectrum, which appears to rule out Otero's
  suggestion of a Mira variable blended with the short-period
  eclipsing binary.  Instead, the spectrum may suggest that there is a
  hot source in the system, possibly an accreting compact object in an
  eccentric orbit around the F-type stars.  X-ray or UV observations
  are encouraged (vsnet-alert 8797).


  Nova LMC 2005         (RA = 05h10m33s.79, Dec = -69d12'35".2)

    According to the reports by W. Liller, this nova draws quite
  strange light curves; a sudden fading occurred from V=11.5 on Nov 26
  to V=13.0 within a few days.  It soon recovered to V=12.1, then
  showed slow and irregular decline for the next 24 days, to V=14.05
  on Dec 30.  It again brightened to V=12.51 on Jan 10.  The last two
  observations show it is fading slowly: on Jan 15 at V = 13.0 and Jan
  19 at V = 13.17.  In the time-series data, he found irregular
  variations of amplitudes of 0.1-0.2mag.  On Jan 10, in particular, 
  the fluctuations became quite rapid with changes of 0.15 mags in
  about 45 seconds.  Spectroscopic and other wavelengths observations
  are encouraged (vsnet-alert 8800).


*** General information ***

  ASAS 023322-1047.0
    Light curve and images in the ASAS page:
      http://www.astrouw.edu.pl/cgi-asas/asas_disc/023322-1047.0,3754
                                      [vsnet-alert 8801]
    Image taken by D. Rodriguez:
      http://astrosurf.com/blazar/variable/UG06/ASAS023322.jpg
                                      [vsnet-alert 8801]
    Chart presented by AAVSO:
      http://www.aavso.org/cgi-bin/searchcharts3.pl?name=ASAS023322
                                      [vsnet-alert 8805, also see
                                       8806, 8807, 8808, 8810, 8811,
                                       8812]
  FQ Mon
    Light curve by H. Maehara:
      http://www.cetus-net.org/ftp/light_curves/monfq-20060118.png
                                      [vsnet-alert 8798]


(This summary can be cited.)	

Regards,
Makoto Uemura
Hiroshima University