[vsnet-campaign-news 286] VSNET Weekly Campaign Summary

[uemuram at hiroshima-u.ac.jp]

VSNET Weekly Campaign Summary

*** Headlines ***

A possible black hole X-ray binary ----- XTE J1818-245

*** Last week news ***

(new targets)
  XTE J1818-245            (RA = 18h18m24s.4, Dec = -24d32'18".0)

    A. M. Levine, the ASM/RXTE team, reported the detection of a new
  X-ray transient.  It X-ray spectrum is very soft, suggesting a
  black hole X-ray binary with a thermal emission (vsnet-campaign-xray
  375).  C. B. Markwardt et al. reported that the spectrum is
  reasonably well fit by a strong soft thermal component (kT ~0.5 keV) 
  plus a steep power law (gamma ~2.6), and a feature near 6.4 keV.   
  No pulsations are detected (vsnet-campaign-xray 376).  
  D. Steeghs et al. reported the discovery of its optical counterpart.  
  The object was about R=17.5 on Aug 17/18 (vsnet-campaign-xray 378).
  The Swift observatory also confirmed the X-ray sources 
  (vsnet-campaign-xray 380).


  CP Dra                   (RA = 10h15m39s.88, Dec = +73d26'05".4)

    J. Shears caught an outburst of CP Dra with 15.4C mag at Aug 14
  21.02 UT.  This star was confirmed to be an SU UMa-type dwarf nova
  with a relatively long superhump period of 0.084 d during the 2001
  Feb/Mar superoutburst.  Since this superoutburst, three outbursts
  have been reported in 2002 March, 2003 January, and 2003 November,
  and all these were proved to be superoutbursts (vsnet-campaign-dn
  4496).


  H 1743-322               (RA = 17h45m02s, Dec = -32d13'.6)

    According to ATEL #575, M.P. Rupen et al. report a re-appearance
  of the black hole candidate H 1743-322 in the radio range 
  (vsnet-campaign-xray 373).
   

  CTCV J1300-3052          (RA = 13h00m29s.1, Dec = -30d52'57")

    This object is a CV from the Calan Tololo survey.  B. Monard found
  an outburst on 11 Aug, and reported his detection of two eclipses on
  Aug 13 and 14 (vsnet-campaign-dn 4497, vsnet-campaign 1591).  He
  also reported that the outburst continued (vsnet-campaign-dn 4501).

  
  KV And                   (RA = 02h17m13s.85, Dec = +40d41'30".6)

    The object is in superoutburst since Aug 4 (vsnet-campaign-dn
  4494). 


  Var79 Peg                (RA = 21h54m33s.66, Dec = +35d50'17".4)

    G. Poyner detected a possible superoutburst on 17 Aug (14.1mag)
  (vsnet-campaign-dn 4500, 4503).


  NSV 601                  (RA = 01h42m27s.64, Dec = -22d16'29"4)

    S. Otero found that NSV 601 is a dwarf nova based on the ASAS-3
  data base.  The maximum magnitude in the 15-days long outburst
  recorded by ASAS (the only one to date in November 2001) is V=
  12.2 (vsnet-campaign-dn 4504, 4505).
 
 
  V660 Her                 (RA = 17h42m07s.3, Dec = +23d47'37".3)

    G. Poyner reported an outburst (15.3mag) of V660 Her on Aug 20.  
  The last superoutburst occurred in 2004 Oct.  The usual maxima of
  superoutbursts reach 14.5 mag.  The present brightness suggests a
  normal outburst (vsnet-campaign-dn 4507).


  New object near M27      (RA = 19h59m51s.29, Dec = +22d42'32".3)

    A new object was found near M27 by H.G. Lindberg.  D. Boyd
  reported V=16.17 and I=16.00 on Aug 21 (vsnet-alert 8628).  T. Kato
  commented that this blue color may suggest an outbursting dwarf nova
  (vsnet-campaign 1592, 1593).


(old targets)
  Nova SMC 2005
                           (RA = 01h14m59s.92, Dec = -73d25'35".8)

    The object is now fading to 13th mag (vsnet-campaign-nova 1736,
  1739). 


  EI Psc                   (RA = 23h29m54s.30, Dec = +06d28'10".9)

    T. Kato commented that the last superoutburst is even brighter
  than the 2001 one (vsnet-campaign-dn 4493).  The superoutburst
  continued until 12 Aug.  It was unexpectedly short for such a short
  period, rarely outbursting, system (vsnet-campaign-dn 4495, 4498).
  A rebrightening was observed on 17 Aug (vsnet-campaign-dn 4499,
  4502).  The object faded from the rebrightening (vsnet-campaign-dn
  4506). 


  V5116 Sgr                (RA = 18h17m50s.77, Dec = -30d26'31".2)

    The object has recently remained at 11th mag 
  (vsnet-campaign-nova 1737, 1738, 1740).


  V1663 Aql                (RA = 19h05m12s.50, Dec = +05d14'12".0)

    The nova is now at 15th mag (vsnet-campaign-nova 1737, 1738).


  SN 2005df                (RA = 04h17m37s.85, Dec = -62d46'09".5)

    A brightening of this object was reported in mid-Aug 
  (vsnet-campaign-sn 1037, 1038).


  V1188 Sco                (RA = 17h44m21s.59, Dec = -34d16'35".7)

    The object is now gradually fading (vsnet-campaign-nova 1737,
  1738, 1740). 


  V378 Ser                 (RA = 17h49m24s.57, Dec = -12d59'59".2)

    K. Nakajima reported V=15.54 on Aug 10
  (vsnet-campaign-nova 1737).


  AM Her                   (RA = 18h16m13s.4, Dec = +49d52'03".1)

    The object experienced a fading again on Aug 17
  (vsnet-campaign-polar 45).


*** Future schedule ***

  Optical Campaign for Outbursts of Southern Intermediate Polars
    --- Prompt Spectroscopy with Cerro Tololo 1.5-m Telescope ---
    ***** August - December 2005 *****
  For detailed informatio, see:
      http://home.hiroshima-u.ac.jp/~uemuram/ipoutburst2005/index.html
                                        [vsnet-campaign-ip 121]


*** General information ***

  V1188 Sco
    Chart provided by S. Otero:
      http://ar.geocities.com/varsao/Carta_V1188_Sco.htm
                                        [vsnet-campaign-nova 1741]
  XTE J1818-245
    Chart provided by D. Steeghs et al.:
      http://hea-www.cfa.harvard.edu/~dsteeghs/Images/XTEJ1818-245.jpg
                                        [vsnet-campaign-xray 379]

  (Recent astro-ph preprints)
  astro-ph version of the Science paper on LS 5039:
      http://xxx.lanl.gov/abs/astro-ph/0508298
                                        [vsnet-campaign-xray 374]


(This summary can be cited.)	

Regards,
Makoto Uemura
Hiroshima University