[vsolj-alert 801] VSNET Weekly Campaign Summary

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

From owner-vsnet-campaign@kusastro.kyoto-u.ac.jp Tue Jul 11 06:30 JST 2000
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Date: Tue, 11 Jul 2000 06:11:09 +0900
From: Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>
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VSNET Weekly Campaign Summary

*** Last week news ***

(new targets)
  QW Ser		(RA = 15h26m13.99s, Dec = +08d18'03".8)

    P. Schmeer has caught a bright outburst of QW Ser, originally known as 
  TmzV46 which was a candidate of SU UMa-type dwarf nova (vsnet-campaign 302). 
  P. Schmeer confirmed the outburst at 12.88mag on July 6.18 
  (vsnet-campaign 309).  CCD photometry performed by R. Novak at Nicholas
  copernicus observatory definitely showed the superhumps and established 
  that it is a new SU UMa-type dwarf nova (vsnet-campaign 317, 
  vsnet-alert 5072).  He reported the superhump period and the amplitude 
  in [vsnet-alert 5073], and later revised the value to be the period of 
  0.0773(1) and amplitude of 0.15(2) mag (vsnet-campaign 327).  E. Pavlenko 
  reported their observations which yielded the superhump amplitude to be 
  0.15mag and the period to be 0.070+-0.003d (vsnet-campaign 324).  
  G. Masi reported his light curve which showed another short hump on 
  normal superhump light curve (vsnet-campaign 348, vsnet-campaign-data 10).
    Now it is still in superoutburst and the current magnitude is about 
  12.7mag.  Time-series observations are strongly urged.


  NY Ser		(RA = 15h13m02.39s, Dec = +23d15'07".1)

    D. Nogami and his collaborators have carried out spectroscopic 
  observations of NY Ser during July 08/09 and 09/10 nights, and found 
  this star to be in outburst in both nights (for more details, see below 
  "*** Future schedule ***") (vsnet-campaign 349).
    It is possible that they succeed in taking the spectra around the 
  maximum of outburst.  Follow-up observations are strongly urged. 


  MM Sco		(RA = 17h30m45.68s, Dec = -42d11'09".2)

    MM Sco further brightened at 13.3mag on July 5.  The present brightness 
  has reached that of the long, bright outburst in 1998 July.  It is likely 
  a long-period SS Cyg star (long outbursts only), but there may not have 
  been an attempt to check short-term variability during outburst 
  (vsnet-campaign 305).  Now it is still in the outburst.
    The star possibly needs outburst astrometry, since the crowded field has 
  made unambiguous identification a bit difficult.


  MKN421		(RA = 11h04m27s, Dec = +38d12'32")

    The blazar MKN421 (Markarian 421) has remarkably faded since the end of 
  June.  The present level of faintness was only attained in early 1996 
  (vsnet-campaign-blazer 15).  D. Rodriguez reported his CCD observation 
  of V=13.5mag, which confirmed the tendency (vsnet-campaign-blazer 16).
    The fading trend is still ongoing.  The current magnitude is about 
  13.5mag.  Please keep attention.


  RX J1155.4-5641	(RA = 11h55m27.6s, Dec = -56d41'48")

    B. Monard reported the suspected ROSAT CV, RX J1155.4-5641 has shown 
  a sudden brightening from 14.4mag on July 1 to 12.5mag on July 4.
  T. Kato noticed that the decline rate more suggests an SS Cyg-type
  outburst (vsnet-campaign 312).  The object reached its peak of 12.2mag 
  on July 4, and then, began fading.


  HadV62		(RA = 18h32m18.4s, Dec = -26d30'14")

    K. Haseda reported the discovery of a new variable star (HadV62).  
  The amplitude suggests a Mira star, but the absence of the image on the 
  RealSky (confirmed by Haseda), likely identifications with the blue 
  Tycho2 (but missing on GSC) star, and the absence of an IRAS source which 
  is expected for this bright variable, is unusual (vsnet-alert 5077).
  On the basis of the unfiltered CCD observation by Kyoto team, T. Kato 
  suggested it is a relatively red star (vsnet-alert 5085).  He also noticed 
  that HadV62 is possibly identified with V1901 Sgr (vsnet-alert 5086). 
    The current magnitude is about V=11.8mag.


  RX J2315.5-3049	(RA = 23h15m31.93s, Dec = -30d48'47".0) 

    As reported in [vsnet-outburst 245] by R. Stubbings, the ROSAT-selected
  dwarf nova candidate RX J2315.5-3049 is undergoing the first-ever 
  detected outburst.  Stubbings reported that the star was at mv=13.4 on 2000 
  July 8.  The outburst amplitude is thus about 4 mag (vsnet-campaign 338). 
    Now it is in outburst.  Observations are encouraged.


(continuous targets)
  CI Aql                (RA = 18h52m03.6s, Dec = -01d28m38.9s)
  
    The fading observed at Kyoto on July 4 well correspond to the primary 
  minimum, and variations between nights almost certainly reflect orbital 
  modulations (vsnet-campaign-nova 30).  A sharp peak was observed around 
  MinII on July 5 (vsnet-campaign-nova 32).  The observation on July 3 by 
  S. Kiyota confirmed the secure appearance of primary eclipses 
  (vsnet-campaign-nova 33, vsnet-campaign-data 7).  L. Kral caught the 
  whole primary eclipse on July 5/6 and reported the eclipse depth of about 
  0.2mag and the duration of about 2.3 hours (vsnet-campaign 314, 
  vsnet-campaign-data 8).  
    Observations at other longitudes and other phases are strongly encouraged.


  1432-0033             (RA = 14h35m00.14s, Dec = -00d46'07".0)

    This new eclipsing SU UMa-type dwarf nova slightly faded from the 
  superoutburst since June 24, but observations are strongly urged 
  (vsnet-campaign 297).

  
  V1504 Cyg             (RA = 19h28m55.87s, Dec = +43d05'39".9)

    On July 6, E. Pavlenko reported that this SU UMa-type dwarf nova was 
  still undergoing the superoutburst with the mean period 0.07d, as it was 
  found by D. Nogami earlier, and amplitude, which evolved from 0.25 mag 
  to 0.15 mag during 5 days since the beginning of the superoutburst. 
  She noticed that ~1' to the North from V1504 Cyg, there is another 
  variable star which should not use as the comparison star 
  (vsnet-campaign 301).
    

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

    The outburst of this possible SU UMa-type dwarf nova is ongoing.
  A. Pearce reported the last negative observation before the outburst 
  of <15.2mag on June 29.843 (vsnet-campaign 289).  The superoutburst 
  was interrupted by a rapid fading since July 8 (vsnet-campaign 339). 
  
   
  BF Ara                (RA = 17h38m10.40s, Dec = -47d10'43".4)

    This possible first southern ER UMa star is still in the long 
  outburst since June 29 (vsnet-campaign 347).
    It is now still in outburst.  The current magnitude is about 14.7mag. 
  More observations are strongly encouraged.


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

    The helium dwarf nova V803 Cen has become even brighter on July 4.382 
  (13.2 mag)(vsnet-campaign 299).  It faded at 14.0mag on July 4.698, 
  and then, brightened again at 13.2mag on July 6.417 (vsnet-campaign 322). 
    Time-resolved photometry during the present stage is very important.


  PKS2005-489           (RA = 20h05m47.4s, -48d58'45".0)

    The blazar PKS 2005-489 was reported to be fading from the current
  bright state (12.3mag on June 29 - 12.8mag on July 4) 
  (vsnet-campaign-blazer 18).


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

    S. Bloom reported his CCD observation of V=14.2 and R=13.6 on July 3 
  in [vsnet-campaign-blazer 13], indicating that a slightly active phase 
  is still ongoing.  A fading ( <15mag ) has been observed since July 3 
  (vsnet-campaign-blazer 20).


  XTE J1118+480         (RA = 11h18m10.9s, Dec = +48d02'12".9)

    From the data during JD2451720 - 2451730 observed by VSNET collaboration 
  team, it was revealed that humps are still prominent with the amplitude 
  of about 0.08 mag and their profile is roughly sinusoidal.  The object 
  keeps its gradual fading (0.06 mag/d) (vsnet-campaign 328).
    More time-series observations are encouraged.


  V382 Vel		(RA = 10h44m48.4s, Dec = -52d25'31")

    A possible variability was noticed in [vsnet-campaign-nova 21], 
  however, M. Morel (vsnet-campaign-nova 23) and B. Monard 
  (vsnet-campaign-nova 24) commented that there must be a difference 
  in the sequence used among observers. A. Retter additionally commented 
  that the nova, still bright at mV=10.5-11.0 is a very promising object 
  to search for periodicities even if the apparent oscillation was 
  spurious (vsnet-campaign-nova 28).  S. Otero suggested that 
  GSC 8210-00897 is the most suitable comparison star (vsnet-campaign-nova 29).
    A few long continuous nights with a CCD might be useful.


(outburst predictions)

  V893 Sco

    T. Kato reported in [vsnet-campaign 313] that the next outburst of 
  V893 Sco is expected and the observations are strongly encouraged.
  (about eclipse ephemeris, see below)


*** 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]

  NY Ser spectroscopic observations at the Calar Alto Observatory
                (July 08/09 and 09/10)
    D. Nogami noticed their schedule of spectroscopic observations of 
  NY Ser and wrote: "Because it is quite important for us to know the 
  state of NY Ser at our observations as accurately as possible, we would 
  ask observers to make a close monitor of this star for ~1 month from 
  now (this article was posted on June 29)."
    For more information, please see [vsnet-campaign 265], or contact 
  with D. Nogami (daisaku@uni-sw.gwdg.de).
                                                [vsnet-campaign 265]

  V446 Her campaign (throughout this summer)

    Boris T. Gaensicke organize a campaign on the post nova V446 Her (V~18). 
  Their aim is to obtain a *good* contiguous light curve of V446 Her that
  covers 2-3 dwarf nova-like outbursts of the system, in order to compare 
  its outburst characteristics to those of ``normal'' dwarf novae. 
  They invite those of you equipped with a CCD camera to obtain a couple 
  of images of V446 Her per night throughout the next three months, say, 
  until the end of September.
    For more information, please see [vsnet-campaign 325] or contact 
  with Boris T. Gaensicke (boris@uni-sw.gwdg.de).


*** General information ***

  RX J1450.5+6403

    The following sequence has been made available by courtesy of Dr. Henden:
	http://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/j1450.dat
    (vsnet-campaign 295)

  QW Ser

    The following sequence has been made available by courtesy of Dr. Henden:
	http://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/qwser.dat
    (vsnet-campaign 308)

    Light curve by R. Novak can be seen in [vsnet-campaign 327]
    Light curve by J. Pietz can be seen at:
	http://home.t-online.de/home/Jochen.Pietz/qwser.gif
    Light curve by G. Masi can be seen at:
	http://vsnet.eurolink.it/comets/qwser.gif

  V893 Sco

    Eclipse ephemeris: see [vsnet-campaign 313]

  CI Aql
 
    Light curve by L. Kral:
	http://ostrava.astronomy.cz/stars/ciaql/cien.htm
    (vsnet-campaign 314)


(This summary is reproduction free.)

Regards,
Makoto Uemura

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