[vsnet-campaign-news 306] VSNET Weekly Campaign Summary

[Makoto Uemura]

VSNET Weekly Campaign Summary

*** Headlines ***

R E C U R R E N T   N O V A !!! ----- RS Oph

*** Last week news ***

(new targets) 
  RS Oph                (RA = 17h50m13s.56, Dec = -06d42'30".6)

    K. Kanai and H. Narumi discovered an eruption of the recurrent
  nova, RS Oph (4.5mag on Feb 12.829UT by H. Narumi; 4.6mag on Feb
  12.848UT by K. Kanai) (vsnet-alert 8859, 8860).  The last nova
  eruption of RS Oph occurred in 1985 Jan.  W. Renz confirmed
  it at 4.8mag on Feb 13 (vsnet-alert 8861, 8862).  G. Sostero and
  E. Guido reported results of multi-color photometry on Feb 13;
  B=5.65, V=5.04, and R=4.43 (vsnet-alert 8866).  M. Fujii took a
  spectrum on Feb 13.  The FWHM of Halpha was 3300 km/s, which is much
  broader than in quiescence.  H_alpha is in a P Cyg profile.  
  The series of FeII emission lines is also strong and broad.  
  A doubly-peaked emission feature around 5890A is probably
  attributable to NaI D (vsnet-alert 8869). 


  ASAS 173313-2421.1    (RA = 17h33m13s, Dec = -24d21'.1)

    On Feb 10, G. Pojmanski reported a discovery of a new object by 
  the ASAS3V system.  The object was first recorded on Feb 9 at
  V=12.077.  No earlier observation is available in the ASASV system
  (vsnet-alert 8852, 8853).  H. Maehara and S. Kiyota performed
  multi-color photometry on Feb 10, and commented that the object
  seems to be a reddened nova (vsnet-alert 8854, 8855).  M. Fujii 
  took a spectrum of this object, which shows a strong H_alpha
  emission line having a P Cyg profile.  This reveals that the object
  is actually a nova (vsnet-alert 8868).


  XTE J1817-330         (RA = 18h17m43s.54, Dec = -33d01'06".7)

    According to ATel#733, a bright optical counterpart (g'=14.93) 
  was discovered in a black hole candidate X-ray binary, XTE J1817-330 
  (vsnet-alert 8856).


  mu Cen                (RA = 13h49m36s.99, Dec = -42d28'25".4)

    S. Otero reported on Feb 12 that mu Cen has brightened to V=3.1. 
  He commented that AAVSO data show it has never been this bright
  since observations started to be collected back in 1984 
  (vsnet-alert 8858).


(old targets)
  ASAS 102522-1542.4    (RA = 10h25m22s.23, Dec = -15d42'21".5)

    H. Maehara reported a revised superhump period to be 0.063353(12)
  day (vsnet-campaign-dn 4584).  H. Maehara reported a rapid decline
  from the superoutburst on Feb. 10.  The object was about 16.5mag on
  Feb 11 (vsnet-alert 8857).  The object experienced a rebrightening
  on Feb 14 as observed by H. Maehara (~16.3mag).  It was about
  17.5mag on Feb 12 (vsnet-alert 8865).  Using combined data sets by
  H. Maehara and K. Nakajima, H. Maehara reported a rapid rate of the
  rebrightening at 8 mag/day on Feb 13 (vsnet-alert 8870). 


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

    H. Maehara revised the best early superhump and ordinary superhump
  periods to be 0.054902(45) and 0.055977(36) days, respectively
  (vsnet-campaign-dn 4583).  H. Maehara reported a rapid decline from
  the superoutburst on Feb 13 (vsnet-alert 8864).


*** General information ***

  RS Oph
    Charts provided by S. Otero:
      http://ar.geocities.com/varsao/Carta_RS_Oph_SV.htm
                                        [vsnet-alert 8863]
    Image obtained by G. Sostero and E. Guido:
      http://astronews.uai.it/p/RS_Oph_13Feb06_Gui-Sos1.JPG
                                        [vsnet-alert 8867]
    Spectrum taken by M. Fujii:
      http://www1.harenet.ne.jp/~aikow/etc/rs_oph_20060213.gif
                                        [vsnet-alert 8869]
  ASAS 173313-2421.1
    Spectrum taken by M. Fujii:
      http://www1.harenet.ne.jp/~aikow/etc/asas173313_20060212.gif
                                        [vsnet-alert 8868]
  1RXS J053234.9+624755
    Charts provided by M. Simonsen, see [vsnet-alert 8850]

  Open European Journal on Variable Stars
    (http://var.astro.cz/oejv) has been completely included into
    famous Simbad database [vsnet-alert 8851]


(This summary can be cited.)	

Regards,
Makoto Uemura
Hiroshima University