[Message Prev][Message Next][Thread Prev][Thread Next][Message Index][Thread Index]

[vsnet-campaign 1226] VSNET Weekly Campaign Summary




VSNET Weekly Campaign Summary

*** Last week news ***

(new targets)
  SN 2001fh		(RA = 21h20m42s.50, Dec = +44d23'53".2)

    IAUC 7744 tells the discovery of SN 2001fh at r=17.87 by the 
  KAIT team on November 3.2 and 5.2.  H. Yamaoka reported that 
  PGC 66592, the host galaxy of SN 2001fh, is a spiral galaxy 
  enbedded on the Galactic plane.  The expected maximum of SN Ia 
  on the distance of this galaxy is mag about 15.2, but there is 
  a large obsecuration by the interstellar medium in our Galaxy 
  (vsnet-campaign-sn 272).  The Asiago team and the CfA team has 
  taken the spectrum around Nov. 7.0. It was revealed that it was 
  of type Ia slightly before maximum (vsnet-campaign-sn 274).


  SN 2001fu		(RA = 08h52m16s.58, Dec = -17d44'29".8)

    The discovery of SN 2001fu was made on Nov. 5.5 at mag about 15.1.  
  The position is about 25" west and 11" north of the nucleus of the 
  spiral galaxy MCG -03-23-11 (vsnet-campaign-sn 273).  The CfA team 
  also observed SN 2001fu and revealed that it was of type Ia a few 
  weeks past maximum.  They measured the recession velocity of the 
  host galaxy as 1730 +/- 30 km/s.  The expected maximum for typical 
  unreddened SN Ia in this galaxy is mag about 13.5, which occured 
  probably on some date in 2001 September or October 
  (vsnet-campaign-sn 274). 


  4U 1608-522 = QX Nor	(RA = 16h12m42s.6, Dec = -52d25'21")

    According to ATEL #77 (Rutledge), this X-ray transient (neutron 
  star transient) is in outburst, based on RXTE/ASM observations 
  (vsnet-campaign-xray 95).


  EY Cyg		(RA = 19h54m36s.77, Dec = +32d21'54".7)

    The object is now in a rare outburst as reported by H. McGee 
  on November 8 (vsnet-campaign-dn 1862).  The outburst is still 
  ongoing, and the current magnitude is about 12.6mag 
  (vsnet-campaign-dn 1867, 1881).

      
  SAX J2043.6+7717	(RA = 20h43m42s.48, Dec = +77d17'34".8)

    Heise et al. reported in GCN 1138 that this X-ray rich and weak 
  gamma-ray transient is a totally new class of transient phenomena.  
  X-ray emissions during its eruption is non-thermal and the ourburst 
  duration is less than a few thousand seconds.  The optical and 
  infrared counterpart of this object have not been significantly 
  detected (vsnet-campaign-xray 96).


  SN 2001fv		(RA = 11h04m01s.66, Dec = +28d01'55".7)

    IAUC 7750 tells the discovery of SN 2001fv at 16.8mag by 
  M. Armstrong on November 3.  H. Yamaoka reported that NGC 3512, 
  the host face-on spiral galaxy of SN 2001fv, has nearly the same 
  distance as the Virgo Cluster.  The expected maximum for typical 
  SN Ia is mag about 13.  The maximum, however, was possibly missed 
  during the solar conjunction (vsnet-campaign-sn 275). 


  CC Cnc		(RA = 08h36m19s.17, Dec = +21d21'05".4)

    As reported by M. Simonsen on November 10, the SU UMa-type
  dwarf nova CC Cnc is undergoing a bright outburst (13.2mag).
  The present outburst may be a superoutburst.  Since the superhump 
  period has not been precisely determined yet, we would encourage 
  time-series observations to precisely determine the superhump period, 
  superhump excess and the period change (vsnet-campaign 1221).


  AK Cnc		(RA = 08h55m21s.21, Dec = +11d18'14".7)

    As reported by M. Simonsen on November 10, the SU UMa-type
  dwarf nova AK Cnc is undergoing an outburst (13.2mag).  The 
  brightness may suggest a superoutburst, though there was already 
  one in this April (vsnet-campaign 1222).  The outburst is still 
  ongoing (vsnet-campaign-dn 1872).

    
(continuous targets) 
  CI UMa		(RA = 10h18m13s.01, Dec = +71d55'42".8)

    The analysis of the Kyoto Oct. 31 - Nov. 4 data has yielded a 
  superhump period of 0.0628 d.  The amplitude of superhumps has
  decreased during this interval (vsnet-campaign-dn 1846).

 
  1RXS J232953.9+062814 (RA = 23h29m54s.30, Dec = +06d28'10".9)

    The short periodicity of superhumps were confirmed by T. Vanmunster 
  on November 5/6.  This object is now a new SU UMa star below the 
  period minimum (vsnet-campaign 1211, 1212, 1213).  
    The observational campaign has become extensive. The VSNET 
  collaboration team has obtained time-series observations from 
  the Kyoto team (vsnet-campaign-dn 1853, 1875), D. Starkey 
  (vsnet-campaign-dn 1843), J. Pietz (vsnet-campaign-dn 1847),  
  S. Kiyota (vsnet-campaign-dn 1850, 1858),  T. Vanmunster 
  (vsnet-campaign-dn 1863), K. Torii (vsnet-campaign 1220), T. Tanabe 
  and K. Matsumoto (vsnet-campaign 1220), T. Krajci (vsnet-campaign 1224), 
  and A. Giambersio.  
    According to Jingyao et al (1998), The outburst spectrum resembles 
  that of an A-star.  The quiescent spectrum was dominated by Balmer 
  and He I emission lines, indicating that the object is not 
  hydrogen-poor (vsnet-campaign-dn 1844).  Time-resolved spectroscopy 
  during quiescence had been performed by Zharikov and Tovmassian.  
  They reported that a possible orbital period of 0.0446 d, indicating 
  the superhump excess of 3.7% (vsnet-campaign-dn 1852).  During this 
  outburst, spectroscopy and infrared photometry were taken by Dr. 
  David Barrado y Navascues at Calar Alto (vsnet-campaign-dn 1860).  
  The Gunma team also performed spectroscopy and reported a spectra 
  with weak absorption lines of H-beta, H-gamma and H-delta, and the 
  H-alpha emission (vsnet-campaign-dn 1861). 
    B. Skiff reported a proper motion of this object to be 0".049/yer 
  using USNO-A2.0 and GSC-2.2 catalogues (vsnet-campaign-dn 1851).
  H. Yamaoka also reported to be 0".05 - 0".06 /yr using the Kyoto 
  images (vsnet-campaign-dn 1857).
    The superhump period was calculated to be 0.046330(10) d 
  (vsnet-campaign-dn 1845, 1847, 1854).  T. Kato reported a period 
  increase of superhumps.  The mean period derivative is dot{P}/P = 
  6x10^(-5) (vsnet-campaign-dn 1859).  The amplitude of humps became 
  smaller with time, and on November 7, the object rapidly faded 
  (vsnet-campaign 1218, 1219).  The fading rate became gradual 
  on November 9 (vsnet-campaign-dn 1864).  On late November 9, the 
  object experienced a rebrightening reaching 13.0mag 
  (vsnet-campaign 1220).  During this rebrightening, T. Vanmunster 
  detected superhumps as in the plateau phase (vsnet-campaign 1223, 
  1225).  It has faded with the duration of about 1 day 
  (vsnet-campaign-dn 1876, 1877, 1878).  T. Kato wrote in 
  [vsnet-campaign-dn 1879] that the persistence of superhumps is 
  similar to ER UMa stars (vsnet-campaign-dn 1879).  The D. Starkey's 
  data on the fading phase show a slightly shorter periodicity of 
  0.04608(4) d, indicating a possible orbital modulations 
  (vsnet-campaign-dn 1880).


  T Leo			(RA = 11h38m26s.96, Dec = +03d22'08".1)

    The superoutburst seems to finish around November 6 
  (vsnet-campaign-dn 1855, 1871).


  AM Cas		(RA = 02h26m23s.40, Dec = +71d18'32".3)

    The outburst is still ongoing.  The current magnitude is about 
  12.8mag (vsnet-campaign-dn 1868).


  U Gem                 (RA = 07h55m05s.55, Dec = +22d00'09".2)

    The outburst is fading now (vsnet-campaign-dn 1856, 1869).


  SDSSp J173008.38+624754.7	(RA = 17h30m08s.38, Dec = +62d47'54".7)

    The observation on November 6 by the Kyoto team showed the 
  object brightened again.  This brightening may be a 
  post-superoutburst rebrightening, or may represent the start of 
  the phase of recurring normal outbursts.  In the latter case, 
  the recurrence time is expected to be short as inferred by the 
  observation (vsnet-campaign-dn 1849).


  Nova Cen 2001		(RA = 13h55m41s.27, Dec = -64d15'57".9)

    The object was further fading under 12.5mag 
  (vsnet-campaign-nova 654).


  MV Lyr		(RA = 19h07m15s.93, Dec = +44d01'10".7)

    The object is rather steady at around 13.4mag 
  (vsnet-campaign-nl 51).


  WZ Sge		(RA = 20h07m36s.53, Dec = +17d42'15".3)

    The slow fading still continues.  The object is now about 14.9mag  
  (vsnet-campaign-dn 1870, 1882).


  BL Lac		(RA = 22h02m42.86s, Dec = +42d16'37.6")

    The object was slightly brighter (vsnet-campaign-blazar 231).


  RU Peg		(RA = 22h14m02s.58, Dec = +12d42'11".4)
   
    The object is rather active around about 12.2mag 
  (vsnet-campaign-dn 1873).


  DW Cnc		(RA = 07h58m56s.80, Dec = +16d16'48".2)

    The object is still acrive (vsnet-campaign-dn 1874, 
  vsnet-campaign-nl 52).


*** Future schedule ***

  WZ Sge campaign 
    D. Steeghs wrote:
	"Several of us are organizing a campaign on the current outburst 
  of WZ Sge, using a large variety of ground based facilities as well as 
  space observatories.  A web-page has been setup listing the scheduled 
  observations so far which we intend to keep up to date at:

	http://vsnet.astro.soton.ac.uk/~ds/wzsge.html
  "
  For more information, see [vsnet-campaign 1039]


  Supernova campaign: A great opportunity for amateurs by M. Schwartz.
    For more detailed information, see [vsnet-campaign-sn 233]
    announce on the HST observations, see [vsnet-campaign-sn 240, 246]
 

  International Conference on Classical Nova Explosions
	 Sitges (Barcelona), Spain: 20-24 May 2002
    For more detailed information, see http://vsnet.ieec.fcr.es/novaconf
					[vsnet-campaign-nova 643]

  Blazar meeting at Tuorla: June 17-21, 2002
	for more information, see http://vsnet.astro.utu.fi/blazar02
					[vsnet-campaign-blazar 232]

 
*** General information ***

  1RXS J232953.9+062814
    Superhump light curve by the Kyoto team:
	http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/J2329/hump.gif
					[vsnet-campaign 1214]
    Image during the outburst by the Kyoto team:
	http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/J2329/im.gif
					[vsnet-campaign 1215]
    VSNET web page:
	http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/J2329.html
					[vsnet-campaign 1216]
   
  ROSAT CVs in Jingyao, H. et al., 1998, Ann. Shanghai Obs., Acad. Sin., 
								19, 235
	1RXS_J012750.5+380830  012750.60 +380812.0 R=16.8  (UG:)
	1RXS_J062518.2+733433  062516.23 +733438.9 R=14.5  (UG:)
	1RXP_J113123+4322.5    113122.40 +432238.0 R=14.9  (UG:)
	1RXS_J230949.6+213523  230949.28 +213519.0 R=15.6 (*)
					[vsnet-campaign 1217]

  TK4
    revised chart presented by A. Henden:
	http://ftp.nofs.navy.mil/pub/outgoing/aah/temp/tk4v.jpg
					[vsnet-campaign-dn 1865, 1866]

  WZ Sge
    eclipse ephemeris, see [vsnet-campaign-dn 1883]


(This summary can be cited.)	

Regards,
Makoto Uemura

VSNET Home Page


vsnet-adm@kusastro.kyoto-u.ac.jp

VSNET Home Page

Return to Daisaku Nogami


vsnet-adm@kusastro.kyoto-u.ac.jp