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[vsolj-alert 790] Weekly VSNET campaign summary

From owner-vsnet-campaign@kusastro.kyoto-u.ac.jp Tue Jun 20 03:23 JST 2000
To: vsnet-campaign
cc: uemura
Date: Tue, 20 Jun 2000 03:05:57 +0900
From: Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>
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Subject: [vsnet-campaign 234] VSNET Weekly Campaign Summary
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VSNET Weekly Campaign Summary

*** Last week news ***

(new targets)
  FX Cep		(RA = 21h03m12.5s, Dec = +66d10m51.2s)

    T. Vanmunster performed a CCD photometry of FX Cep which is 
  undergoing an outburst, on Jun 17/18.  During 3.7 hours run, the 
  object, at 15.5mag, did not show any periodic signals (vsnet-campaign 227).
    He mentioned this result seems to support FX Cep's classification 
  as an UGSS-type dwarf nova, although more intensive observations 
  are required.

  NSV02872		(RA = 06h14m08.2s, Dec = +45d30m29s)

    This ROSAT-selected objects are put on the long-term vsnet-campaign
  (monitoring for outburst) program (vsnet-campaign 230).
  (see, http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chat/msg03107.html)

  PT Per		(RA = 02h42m51.2s, Dec = +56d41m31s)

    This ROSAT-selected objects are put on the long-term vsnet-campaign
  (monitoring for outburst) program (vsnet-campaign 230).
  (see, http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chat/msg03113.html)

  V893 Sco		(RA = 16h14m45.26s, Dec = -28d39m30.3s)

    According to R. Stubbings, the eclipsing dwarf nova (SU UMa candidate) 
  below the period gap is in outburst at 12.6mag on June 19 
  (vsnet-campaign 231).  The present brightness suggests a normal 
  outburst, but no one knows whether this outburst evolves into a 
  superoutburst ?!

  V436 Cen		(RA = 11h13m58.2s, Dec = -37d40m45.0s)

    Although the season is ending, the SU UMa-type dwarf nova V436 Cen
  is undergoing a rare outburst at 11.9 mag on 19 June (vsnet-campaign 233, 
  vsnet-alert 4998).  The last outburst (normal outburst) was observed 
  around 2000 Jan. 1, reaching mv=11.8.  The last reported superoutburst 
  occurred in 1998 October (vsnet-alert 4998). 
    The present brightness does not exclude the possibility of a 

(continuous targets)
  V1494 Aql		(RA = 19h23m05.4s, Dec = +04d57m20.1s)

    A. Retter reported that his observation during 3 nights in June 
  revealed the evidence for a periodicity of 1.5 hours with the variation 
  amplitude of 0.05mag (vsnet-campaign 207).  L. Cook also detected 
  the periodic variation (P=91min) and the amplitude of about 0.04mag 
  (vsnet-campaign 216, 222).  He also reported the object showed 
  0.109mag decline over the 24 hours (vsnet-campaign 222).
    The current magnitude is about 10.4mag.  More observations are 

  XTE J1118+480		(RA = 11h18m10.9s, Dec = +48d02m12.9s)

    From the data from JD2451700 to 2451710 observed by VSNET collaboration 
  team (Kyoto team and L. Cook), the period is calculated as 0.17062(11)d.
  The ten days averaged light curve shows a flat peak and a flat bottom. 
  The amplitude of the humps does not change from the previous one 
  (about 0.08 mag) (vsnet-campaign 210).
    The hump is still prominent.  To study the hump evolution and 
  optical QPOs, more observations are urged.

  V803 Cen		(RA = 13h23m44.5s, Dec = -41d44m30.1s)
    Strong fluctuations around 14 - 13 mag were observed (vsnet-campaign 208, 
  218, 224, 228).  Observations are strongly needed, since such strong 
  day-scale fluctuation tends to rapidly damp during the slow fade 
  (vsnet-campaign 208).

  CI Aql		(RA = 18h52m03.6s, Dec = -01d28m38.9s)

    The light curve on June 15 by Kyoto team shows a transient brightening
  of 0.3 mag centered at June 15.79 UT superimposed on an apparent rise 
  from the primary minimum (vsnet-campaign 214).  The analysis of combined 
  data by S. Kiyota (Tsukuba, Japan) and the Kyoto team on Jun. 15 has 
  yielded a detection of the primary eclipse minimum.  The eclipse was 
  0.3mag deep.  A preliminary analysis yielded a mid-eclipse time of 
  15.597 UT, while the prediction (based on the epehemeris in IBVS 4232,
  Mennickent and Honeycutt) was 15.586 UT (vsnet-campaign 220). 
    More observations are strongly needed to confirm the positive 
  detection of the eclipse O-C. 

  BD Pav		(RA = 18h43m12.0s, Dec = -57d30m45.1s)
    The eclipsing SS Cyg-type dwarf nova BD Pav has just faded from the
  recent rare outburst (vsnet-campaign 223).

  V493 Lyr		(RA = 19h01m31.9s, Dec = +42d54m46.5s)

    T. Vanmunster reported the light curve on Jun 12/13 is showing 
  some modulation, although he wouldn't attribute it to superhumps 
  (vsnet-campaign 226).  He mentioned it seems V493 Lyr indeed 
  is a long-period UGSS-type dwarf nova, as also suggested by T. Kato, 
  in (vsnet-campaign 194).
    Now it is in fading phase.  The current magnitude is about 15.

  LX Ser		(RA = 15h37m59.1s, Dec = +18d51m43.9s)

    The eclipsing cataclysmic variable LX Ser has been reported fainter 
  (>15mag) since June 11.  Please continue monitoring to see whether 
  the star becomes brighter, as in early June (vsnet-campaign 229).

*** Future schedule ***

  BL Lac campaign  (July 17 - August 11)

    Massimo Villata, Gino Tosti, and Enrico Massaro organize an 
  optical campaign on BL Lac contemporaneous with the high-energy 
  campaign involving X-ray and TeV observatories such as BeppoSAX, 
  RXTE, STACEE, CAT, HEGRA.  Their goal is high-density and 
  high-precision coverage, possibly in two optical bands (B and R).
  Observers interested in participating to this optical campaign are
  invited to contact with M. Villata (villata@to.astro.it).
						[vsnet-campaign 204]

*** General information ***
  CI Aql
    eclipse ephemeris, see [vsnet-campaign 203]

  XTE J1118+480 
    new light curve is seen at:

  BD Pav
    eclipse ephemeris, see [vsnet-campaign 223]

  V893 Sco
    eclipse ephemeris, see [vsnet-campaign 231]

(This summary is reproduction free.)

Makoto Uemura

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