[vsnet-campaign 826] VSNET Weekly Campaign Summary

[Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>]

VSNET Weekly Campaign Summary
 
*** Last week news ***

(new targets)
  CE-315		(RA = 13h12m46s.5, Dec = -23d21'31")

    According to astro-ph/0103355, M. T. Ruiz et al. discovered 
  a ultra-short period CV (helium CV like GP Com).  The binary 
  period is 65.1+/-0.7 min, which seems to make the system something
  intermediate between helium CVs and V485 Cen-like system.
  Since the object is expected to show outbursts as in other 
  similar systems, we encourage observers to monitor this object closely, 
  and report if any brightening is caught (vsnet-campaign 823). 


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

    A possible brightening (14.7mag) was reported on March 19 
  (vsnet-campaign-blazar 169).


  Z UMi			(RA = 15h02m01s.35, Dec = +83d03'48".7)

    The R CrB star is definitely fading, as indicated by the 
  observations reported during the last week.  This is the first 
  fading since 1999 (vsnet-campaign 819).


  CT Hya		(RA = 08h51m04s.50, Dec = +03d07'43".5)

    An outburst (14.9mag) were reported on March 23.  It is likely 
  normal one (vsnet-campaign-dn 608).


(continuous targets)  
  NSV 10934		(RA = 18h40m52s.26, Dec = -83d43'10".24)

    The outbust was terminated during the last week 
  (vsnet-campaign-dn 603).


  RX Cha		(RA = 10h36m26s.33, Dec = -80d02'48".2)

    The outburst still continues (vsnet-campaign-dn 607).


  BF Ara		(RA = 17h38m10s.40, Dec = -47d10'43".4)

    The long outburst continues, and the current magnitude is around 
  14.2-14.4mag (vsnet-campaign-dn 604, 609).


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

    The object is gradually fading (vsnet-campaign-nova 274).


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

    The bright state continues (vsnet-campaign-blazar 170, 171).


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

    R. Novak sent his data to the Kyoto team.  His data confirms 
  the similar periodicity previously reported from the Kyoto and Ouda 
  data.  On March 20, T. Kato reported that the combined data set 
  shows 0.0275 day or its double periodicity (vsnet-campaign 818).
  On March 22, he again reported that the data including the additional 
  one show a very gradual fading trend (0.04 mag/d) which may resemble 
  those of slowly fading plateau of ER UMa stars.  The period analysis 
  yielded multiple period candidates at 0.0756 d, 0.0536 d, 0.0488 d, 
  and 0.0276 d.  He noticed that there may be a hint of beats between 
  these periods, but if any shorter one of them is a superhump/orbital 
  period, this system may be an extremely rare system close to 
  the CV period minimum, or below the period (vsnet-campaign 822).  
  The similar periodicity and an amplitude of 0.4mag modulations are 
  also seen in the J. Pietz's observation (vsnet-campaign 824).  
  The combined data including the Kyoto March 23 data shows 0.05mag 
  period (vsnet-campaign 825).  The bright state continues 
  (vsnet-campaign-dn 602, 605).


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

    A bright outburst was reported on March 19 (vsnet-campaign-dn 599).
  T. Kato performed time-series photometry at Ouda and detected 
  clear doubly shaped humps with respect to the 1490s signal 
  (vsnet-campaign-dn 600).  The object began fading on March 22 
  (vsnet-campaign-dn 606).


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

    The bright state continues, and the current magnitude is 
  around 1.8mag (vsnet-campaign-be 94).


  KR Aur		(RA = 06h15m45s.05, Dec = +28d34'16".0)

    The brightening of this object was reported on March 21 
  (vsnet-campaign-nl 9).


*** Future schedule ***

  RZ LMi campaign conducted by J. Patterson on April 2001

    For more information, see [vsnet-campaign 718, vsnet-campaign-dn 429].


  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].


*** General information ***

  U Gem
    eclipse ephemeris, see [vsnet-campaign-dn 601].


  DW Cnc
    sequence and chart reported by B. Sumner, see [vsnet-campaign 820] or:
	http://joevp.20m.com/cgi-bin/i/charts/hscharts/South_up/Cnc_DW_sxn.jpg
	http://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/dwcnc.dat

  delta Vel
    NASA press release:
	http://vsnet.jpl.nasa.gov/releases/2001/blink.html


(This summary can be cited.)

Regards,
Makoto Uemura

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