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[vsolj-alert 957] VSNET Weekly Campaign Summary



From owner-vsnet-campaign@kusastro.kyoto-u.ac.jp Tue Oct 30 03:07 JST 2001
To: vsnet-campaign
Date: Tue, 30 Oct 2001 03:07:00 +0900
From: Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>
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Subject: [vsnet-campaign 1201] VSNET Weekly Campaign Summary
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VSNET Weekly Campaign Summary

*** Last week news ***

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

    T. Kato reported that during the past one month, the outburst 
  cycle length and amplitude of AM Cas have decreased.  This 
  behavior resemble the behavior in some Z Cam stars just before 
  entering standstills.  Since the existence of standstills has not 
  been very clearly demonstrated in AM Cas, SS Cyg-type star with 
  the shortest outburst cycle length (cf. Kato et al. 2001, MNRAS 
  in press), further detailed observations to follow the consequence 
  of the present behavior are strongly encouraged (vsnet-campaign 1199).


  Possible Nova in SMC	(RA = 00h46m27s.8, Dec = -73d29'40".1)

    B. Liller discovered a possible nova in SMC in the photographs 
  taken at October 21.0857 and Oct. 21.0879.  The magnitude was 12.1 
  mag on the photographs and no object brighter than 13.5 was seen 
  before September 27 (vsnet-campaign-nova 635, 636).  The object 
  rapidly faded around October 23 and 24 (vsnet-campaign-nova 639, 
  641), and now the decline rate becomes more gradual.  The current 
  magnitude is about 13.7mag (vsnet-campaign-nova 647).


  SN 2001fb		(RA = 00h10m06s.15, Dec = -00d26'18".2)

    IAUC 7740 tells that A. Rest reported the detection of an apparent 
  supernova (at magnitudes g' = 20.0, r' = 19.0) on SDSS images taken 
  on October 10.3.  H. Yamaoka reported that the host galaxy of 
  SN 2001fb is UM 207 = SDSS J001006.63-002609.5, whose recession 
  velocity is measured as 9648 km/s.  The expected maximum for typical 
  SN Ia is thus around mag 17 (vsnet-campaign-sn 269).

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

    As reported by M. Simonsen on October 21, an outburst of 
  V1504 Cyg were detected at 14.6mag.  It may be a superoutburst 
  (vsnet-campaign-dn 1764).


  DH Aql		(RA = 19h26m12s.05, Dec = -10d15'21".4)

    As reported by Pavol A. Dubovsky on October 20, an outburst of 
  DH Aql were detected at 13.0mag.  It may be a superoutbust
  (vsnet-campaign-dn 1765).


  TV Col		(RA = 05h29m25s.5, Dec = -32d49'05".2)

    As reported by B. Monard on October 23, an outburst of TV Col 
  was detected at 13.3mag (vsnet-campaign-ip 64).


  DI UMa		(RA = 09h12m22s.16, Dec = +50d49'39".1)
 
    T. Kinnunen reported an outburst reaching 15.4mag on October 23 
  (vsnet-campaign-dn 1176).


  AM Her		(RA = 18h16m13s.4, Dec = +49d52'03".1)

    The polar prototype AM Her has started fading as reported 
  by M. Verdenet (14.2mag) on October 25 (vsnet-campaign 1198).
  The fading continues and the current magnitude is about 14.2mag 
  (vsnet-campaign 1200).


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

    An outburst reaching 12.6mag was detected by M. Simonsen 
  on October 28 (vsnet-campaign-dn 1794).


(continuous targets) 
  SN 2001el		(RA = 03h44m30s.57, Dec = -44d38'23".7)

    This supernova started fading since the last week.  It is 
  now probably fainter than 13.5mag (vsnet-campaign-sn 267).


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

    On October 22, T. Vanmunster reported his detection of superhumps 
  which revealed this object to be an SU UMa-type dwarf nova.  He 
  performed time-series photometry on October 19/20 and detected a 
  part of a hump.  His run on October 22/23 clearly showed a typical 
  superhump profile whose amplitude was about 0.40mag and period was 
  reported to be 0.0801(9) days, relatively long period in SU UMa stars 
  (vsnet-campaign-dn 1758, vsnet-campaign 1196, vsnet-campaign-dn 1760, 
  vsnet-campaign-dn 1763, vsnet-campaign-dn 1772).  The Nyrola and 
  Kyoto team confirmed the humps (vsnet-campaign 1195, vsnet-campaign-dn 
  1759).  T. Kato reported there was some evidence of superimposed QPOs 
  with a period of ~10 min (vsnet-campaign-dn 1768, 1769, 1781). 
  The VSNET collaboration team has received the data from the Kyoto 
  team, T. Vanmunster, and the Nyrola team.  The combined data shows 
  a periodicity of 0.079294(34) d and possible period shortening 
  (vsnet-campaign-dn 1779, 1781, 1786, 1790, 1792).  The object 
  gradually faded with a rate of 0.13mag/d (vsnet-campaign-dn 1790).
    The superoutburst is still ongoing (vsnet-campaign-dn 1770, 1774, 
  1777, 1783, 1795).


  IP Peg		(RA = 23h23m08s.7, Dec = +18d24'59".1)

    The object started fading from the outburst since the end of the 
  last week (vsnet-campaign-dn 1766, 1775, 1784, 1788).


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

    The reported magnitudes showed strong oscillations around 11.1mag 
  (vsnet-campaign-nova 637) until around October 22, and then, it 
  brightened to the second maximum of 10.4mag on October 23 as 
  reported by A. Pearce (vsnet-campaign-nova 638, 640).  The object 
  is fading from the second maximum. It is now at about 11.6mag 
  (vsnet-campaign-nova 644, 646).


  SN 2001ep		(RA = 04h57m00s.26, Dec = -04d45'40".2)

    H. Yamaoka reported that IAUC 7731 (Oct. 10) tells that SN 2001ep 
  is of type Ia near maximum.  Recent observation shows that it seems 
  to be a normal one (vsnet-campaign-sn 268).


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

    It is steady at about 13.4mag (vsnet-campaign-nl 49).


  EF Peg		(RA = 21h15m04s, Dec = +14d03'50")

    The object seems to start a rapid fading from the superoutburst 
  on October 20 as reported by Pavol A. Dubovsky (vsnet-campaign-dn 
  1762).  M. Uemura performed period analysis using the data sets 
  by the VSNET collaboration team (the Kyoto team, D. Starkey, and 
  J. Pietz) and reported a period of 0.086509 (24) d.  Early phase 
  observations by D. Starkey showed a short period or double-peak 
  profile of humps.  The later phase data yields a slightly longer 
  period of 0.086686 (34) d (vsnet-campaign-dn 1171).  After the 
  rapid decline phase, observations by the Kyoto team detected a 
  possible rebrightening on October 24 (vsnet-campaign-dn 1791).  
  It is now at post-superoutburst phase (vsnet-campaign-dn 1785).


  V4740 Sgr		(RA = 18h11m45s.82, Dec = -30d30'49".9)

    The smooth fading continues (vsnet-campaign-nova 642, 645).


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

    The slow fading still continues (vsnet-campaign-dn 1761, 1773, 
  1782).  The VSNET team has received a number of additional data 
  sets from new collaborators (vsnet-campaign-dn 1767).  
    The light curve on October 17 shows possible eclipses and humps 
  at phase near 0.45.  The amplitude of the possible variations was 
  about 0.2mag.  The amplitude seems to be smaller on October 19.  
  We can see possible shallow and wide eclipses.  The eclipses precede 
  the prediction time on October 22.  Two possible dips (or humps?) 
  were seen (vsnet-campaign-dn 1780).  The analysis of the Kyoto 
  Oct. 25 data shows a jump (or eclipse-like fading) at phase 0.2 
  which has not been recorded in the recent light curves 
  (vsnet-campaign-dn 1789).


  V368 Peg		(RA = 22h58m43s.5, Dec = +11d09'13")

    I. Andronov reported that observations of 2000 superoutburst of 
  V368 Peg by them revealed the decrease of the photometric period 
  with luminosity by a factor of 2.3 times.  The more detailed report 
  is available at http://il-a.pochtamt.ru/V368_Peg.htm 
  (vsnet-campaign 1197).

      
*** 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]


*** General information ***

  SDSSp J173008.38+624754.7
    CCD image presented by A. Oksanen:
	http://vsnet.jklsirius.fi/obs/sdss1730map.jpg
					[vsnet-campaign-dn 1778]
    Light curve by T. Vanmunster:
	http://vsnet.lunarpages.com/cbabelgium
					[vsnet-campaign-dn 1787]
  U Gem
    eclipse ephemeris, see [vsnet-campaign-dn 1793]
  

(This summary can be cited.)	

Regards,
Makoto Uemura

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