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[vsolj-alert 878] VSNET Weekly Campaign Summary

From owner-vsnet-campaign@kusastro.kyoto-u.ac.jp Tue May  8 04:04 JST 2001
To: vsnet-campaign
Date: Tue, 08 May 2001 04:04:45 +0900
From: Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>
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Subject: [vsnet-campaign 896] VSNET Weekly Campaign Summary
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VSNET Weekly Campaign Summary
*** Last week news ***

(new targets) 
  WR106 = HadV84	(RA = 18h04m43s.5, Dec = -21d09'29")

    K. Haseda reported the discovery of a new variable star (HadV84).  
  The object is identified with a dusty WC9 star, WR 106, which is 
  similar to WR 104 = HadV82, the "pinwheel star".  These observations
  may suggest a new class of WR-type variable stars.  Since the light 
  variation may suggest that WR 106 = HadV84 is a twin od WR 104  = 
  HadV82, a vigorous search for binarity, and the evidence of the 
  "chimney mechanism" proposed for WR 104 is strongly encouraged.  
  Infrared interferometric observations as in WR 104 would be helpful 
  in elucidating the peculiar characteristics (vsnet-campaign-be 116, 
  vsnet-campaign 892, vsnet-campaign-news 55).  The full range of
  variability is reported to be 11.7-14.1p (vsnet-campaign-be 117).

  BZ UMa		(RA = 08h53m44s.3, Dec = +57d48'40".1)

    The SU UMa-candidate BZ UMa experienced a relatively rare outburst,
  as reported by Pavol A. Dubovsky (vsnet-outburst 2126) at mv=10.8 
  on May 1.8681 and by M. Reszelski (vsnet-alert 5857) at mv=10.8 on 
  May 1.891.  The last outburst occurred in 2000 May (normal outburst).
  None of previously observed outbursts of BZ UMa showed clear 
  characteristics of a superoutburst, which is atypical for a dwarf 
  nova below the period gap (vsnet-campaign 893).  R. Novak performed 
  time-series photometry on May 4 and reported no clear superhumps 
  were seen (vsnet-campaign-dn 746, 747).  The outburst continued 
  until May 3 and started rapid fading (vsnet-campaign-dn 731, 735, 
  743, 748, 749, 753, vsnet-campaign 895).  The outburst is also 
  a normal one.

  BR Lup		(RA = 15h35m51s.61, Dec = -40d34'25".4)

    As reported by R. Stubbings on April 28, the SU UMa-type dwarf 
  nova BR Lup is undergoing a superoutburst.  The object attained 
  the peak brightness at 13.7mag on April 30.  The last likely 
  superoutburst was observed in 2000 December (vsnet-campaign 891).
  The superoutburst is now ongoing and the current magnitude is 
  about 14.0mag (vsnet-campaign-dn 733, 737, 752).

  SN 2001bf		(RA = 18h01m33s.99, Dec = +26d15'02".3)

    IAUC 7620 reports that the discovery of SN 2001bf was made by 
  M. Armstrong on May 3.02 at mag 16.5, and he confirmed it on May 
  4.965 at mag 15.9.  The reported position is 5" east and 8" south 
  of the center of the spiral (?) galaxy MCG +04-42-22.  From the 
  recession velocity of the host galaxy (4647 km/s from NED),
  the expected maximum of the typical SN Ia would be around 15.9 mag 
  (vsnet-campaign-sn 176).  

  V344 Pav		(RA = 19h16m10.21s, Dec = -62d35'54".4)

    An outburst (14.8mag) of V344 Pav was reported on April 29 
  by R. Stubbings.  The object further brightened on April 30, 
  which indicates the outburst was a possible superoutburst 
  (vsnet-campaign-dn 725).  The object is still in the outburst.  
  The magnitude is about 14.9mag or fainter (vsnet-campaign-dn 732, 750).

  SS UMi		(RA = 15h51m22s.4, Dec = +71d45'11".1)

    An outburst was detected on April 28 by M. Reszelski at 15.5mag, 
  and then, the object further brightened to 14.8mag on May 2.  
  This is atypical for a normal outburst.  The present epoch may be 
  a little early for a superoutburst, but one may be ongoing 
  (vsnet-campaign-dn 734).

  NSV08383		(RA = 17h16m53s, Dec = -65d32'42")

    An outburst of 14.2mag was reported on May 2 by A. Pearce.  
  The last outburst was in 2000 September (vsnet-campaign-dn 745).

(continuous targets) 
  QW Ser		(RA = 15h26m13s.99, Dec = +08d18'03".8)

    R. Novak performed time-series CCD observation on April 30 and 
  confirmed the outburst (vsnet-campaign-dn 729).  His 3 hours light 
  curve shows only linear fading modulated by some flickering 
  (vsnet-campaign-dn 741).  On May 1, a fading from the outburst was 
  reported (vsnet-campaign-dn 730), but the fading speed was rather 
  slow for normal outbursts (vsnet-campaign-dn 726, 738).

  DV UMa		(RA = 09h46m36s.67, Dec = +44d46'45".1)

    R. Novak performed CCD observations April 25 and 26, and reported 
  the object became faint (vsnet-campaign-dn 729).  The normal outburst 
  was terminated (vsnet-campaign-dn 727).

  SN 2001bb		(RA = 13h43m25s.31, Dec = -29d48'13".1)

    IAUC 7616 informed that the spectra of SN 2001bb have been taken 
  by Lick and KPNO, which reveal that it is of type I SN, but the 
  subclass is not yet uncertain.  It can be a luminous SN Ia, or 
  hypernova (vsnet-campaign-sn 173).

  V803 Cen		(RA = 13h23m44.5s, Dec = -41d44'30".1)

    The oscillation is still reported.  The object seems to modulate 
  between 13.4-14.4 mag (vsnet-campaign-dn 739, 751, 758).

  3C 279		(RA = 12h56m11s.1, Dec = -05d47'20")

    The object still shows the strong activity (vsnet-campaign-blazar 191).

  CR Boo		(RA = 13h48m55s.42, Dec = +07d57'30".3)

    The object start fading from the outburst.  The current magnitude 
  is about 14.2mag or fainter (vsnet-campaign-dn 740).

  V445 Pup		(RA = 07h37m56s.88, Dec = -25d56'59".1)

    Some observations indicate the object is brightening again in 
  the last week (vsnet-campaign-nova 293, 294).

  OJ287			(RA = 08h51m57s, Dec = 20d17'59")
    The strong activity around 14.9mag is still reported 
  (vsnet-campaign-blazar 192).

  BZ Cam		(RA = 06h29m34s.49, Dec = +71d04'39".5)

    The bright state at about 12.2mag still continues (vsnet-campaign-nl 18).

  Delta Sco		(RA = 16h00m19s.9, Dec = -22d37'17")

    The object is still at very bright state (vsnet-campaign-be 118, 121).
  T. Gandet reported the provisional spectroscopic period of 
  78.860 +/- 0.0017 days and the other orbital elements obtained 
  through the analysis of 56 published radial velocities that cover 
  the interval 1903-1975 (vsnet-campaign-be 119, 120).  S. Otero 
  discusses in [vsnet-campaign-be 122] about a possibility that the 
  current variation is due to an eclipse of the ejected ring.  
  T. Gandet also wrote in [vsnet-campaign-be 123] that delta Sco's 
  mechanism might be analogue to EN Lac-type and/or Beta CMa-like. 

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

    The outburst continued for 10 days, and then, has began fading 
  since around May 6 (vsnet-campaign-dn 728, 736, 757).

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

    The faint state still continues.  The object is fainter than 
  15.2mag as reported by M. Reszelski (vsnet-campaign-nl 19).

  XTE J1118+480		(RA = 11h18m10s.9, Dec = +48d02'12".9)

    According to IAU Circular 7617, J. Casares et al. detected 
  superhumps with a period of 0.17049(1) day using their data 
  during Dec. 2000 - Apr 2001.  The data set obtained during the 
  outburst in 2000 by VSNET team shows the mean superhump period 
  during the outburst is slightly longer than that reported in 
  IAUC 7617, which may imply a continuous period changing.  In the 
  case of SU UMa-type dwarf nova, the "late superhump" is sometimes 
  observed after superoutburst (vsnet-campaign 894).

  IX Dra		(RA = 18h12m32s.2, Dec = +67d04'41")

    An Observation on May 2 by M. Reszelski indicates the object 
  experienced another outburst at 14.9mag (vsnet-campaign-dn 744).
  The Kyoto team observations on May 3 confirmed this outburst 
  and a rapid fading on May 4 (vsnet-campaign-dn 754).

  SN 2001X		(RA = 15h21m55s.46, Dec = +05d03'43".1)

    The current magnitude is about 15.3mag (vsnet-campaign-sn 175).

  SN 2001ay		(RA = 14h26m17s.00, Dec = +26d14'55".8)

    The SN is now gradually fading (vsnet-campaign-sn 174).

  MKN 421           (RA = 11h04m27s, Dec = +38d12'32")

    The object is now at about 12.9mag which is slightly fainter 
  (vsnet-campaign-blazar 193).

*** Future schedule ***

  CR Boo and V803 Cen campaign conducted by J. Patterson

    For more information, see [vsnet-campaign-dn 640 and vsnet-campaign 852]

  Elizabeth and Frederick White Workshop
    AGN variability across the Electromagnetic Spectrum
      25 - 29 June 2001 Sydney, Australia

    For more information, see [vsnet-campaign-blazar 168].

  Two Years of Science with Chandra *
    * This meeting will also be the 12th Annual Maryland Astrophysics 
	September 5-7, 2001
    For more information, see [vsnet-campaign-xray 66]

*** General information ***

  U Gem
    eclipse ephemeris, see [vsnet-campaign-dn 759]

(This summary can be cited.)

Makoto Uemura

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