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[vsolj-alert 928] VSNET Weekly Campaign Summary

From owner-vsnet-campaign@kusastro.kyoto-u.ac.jp Mon Aug 13 05:20 JST 2001
To: vsnet-campaign
Date: Mon, 13 Aug 2001 05:20:52 +0900
From: Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>
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Subject: [vsnet-campaign 1096] VSNET Weekly Campaign Summary
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VSNET Weekly Campaign Summary

*** Last week news ***

(new targets)
  V1329 Cyg		(RA = 20h51m01s.27, Dec = +35d34'53".2)

    The symbiotic nova V1329 Cyg is apparently undergoing an 
  outburst (~12.5mag) as reported during the last week 
  (vsnet-campaign 1065).

  OY Car		(RA = 10h06m22s.46, Dec = -70d14'04".4)

    As reported by P. Williams on August 4, the eclipsing SU UMa 
  type dwarf nova OY Car is undergoing an outburst of 11.2mag 
  (vsnet-campaign 1067).  It was faded to 12.2mag on the next night 
  (vsnet-campaign-dn 1113), and the gradual fading is still continues 
  (vsnet-campaign-dn 1148).

  HadV98		(RA = 17h23m14s.5, Dec = -22d52'05")

    K. Haseda reported the discovery of a new variable star (HadV98).  
  The variable had been almost constant for years at 10.6-10.7mag, 
  and suddenly faded to <12.8mag since around May 2001.  This star 
  may be a new R CrB star or a long-period eclipsing binary 
  (or something else?).  The lack of IRAS detection may be against 
  the R CrB-type interpretation, but has been a result of source 
  confusion (vsnet-campaign 1089).  K. Kanatsu confirmed the fading 
  of this new variable star (vsnet-campaign 1090).

  SN 2001dm		(RA = 01h55m40s.55, Dec = -29d55'20".7)

    Accoring to IAUC 7679, the discovery of a new SN 2001dm was made 
  on Aug 7.5 when the object was mag about 15.4C.  The position is 
  about 7" due west of the nucleus of the spiral galaxy NGC 749.  
  This galaxy has bright bulge and rather faint arm structure, and 
  the SN superimposed on the bulge.  The expected maximum of typical 
  SN Ia on this galaxy is around 15.5 mag (vsnet-campaign-sn 214).

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

    As reported by M. Simonsen on August 7, DH Aql experienced an 
  outburst of 13.5mag (vsnet-campaign-dn 1145).  The outburst was 
  ongoing until August 8, and then, possibly faded 
  (vsnet-campaign-dn 1149, 1162).

  V Sge			(RA = 20h20m14s.75, Dec = +21d06'09".0)

    As reported during the last week, V Sge is now bright at about 
  10.5mag (vsnet-campaign-nl 25).

  RZ Sge		(RA = 20h03m18s.49, Dec = +17d02'52".6)

    RZ Sge is in a possible superoutburst at around 13mag 
  (vsnet-campaign-dn 1182, 1191).

  V1008 Her		(RA = 18h05m46s.31, Dec = +31d40'18".1)

    As reported by M. Simonsen on August 12, V1008 Her is now 
  in outburst at 14mag (vsnet-campaign-dn 1190).

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

    The historical outburst is still ongoing, and the current magnitude 
  is about 10.4mag (vsnet-campaign-dn 1104, 1114, 1140, 1160, 1183). 

    Long waited superhumps have finally appeared: The secondary humps 
  (preceding to the main peak of the early superhumps) became stronger 
  on August 4 (vsnet-campaign 1066, vsnet-campaign-dn 1106, 1107).  
  A longer period of humps were reported, which indicated genuine 
  superhumps were evolving (vsnet-campaign 1068, vsnet-campaign-dn 1108, 
  vsnet-campaign 1069).  L. Cook reported that they found flickerings 
  were greatest in U-band (vsnet-campaign-dn 1109).  On August 5, 
  the evolution of the superhumps were confirmed, and furthermore, 
  their evolution is quite rapid (vsnet-campaign-dn 1112, vsnet-campaign 
  1070, vsnet-campaign 1072, vsnet-campaign 1073, vsnet-campaign-dn 1115, 
  vsnet-campaign-dn 1117, vsnet-campaign 1084, vsnet-campaign 1085).  
  T. Kato and G. Masi obtained an unexpectedly large superhump period 
  with the data obtained on August 5 (vsnet-campaign 1074, 
  vsnet-campaign-dn 1111, vsnet-campaign-dn 1116, vsnet-campaign 1076, 
  vsnet-campaign-dn 1123), however, shorter periods were reported after 
  August 6 (vsnet-campaign 1077, 1078, 1079, 1080, 1081), and then, 
  T. Kato found that there was an interchange of maxima from early 
  superhumps to true superhumps around Aug. 5.8 UT.  This affected the 
  period analysis on Aug. 5, and he determined the period of true 
  superhumps as 0.057157 +/- 0.000077 d (vsnet-campaign 1082).  Both 
  periods are significantly different (vsnet-campaign 1086, 
  vsnet-campaign 1088).  

    Once the superhumps were evolved, however the profile has shown 
  a rapid variation: G. Masi commented that new secondary humps 
  (following to the main peak of genuine superhumps) have appeared 
  since August 6 (vsnet-campaign-dn 1122, 1123, 1120, 1121).  
  T. Kato presented an O-C diagram of early and genuine superhumps 
  in the VSNET web page (vsnet-campaign 1083, vsnet-campaign 1087).  
  On August 7, G. Masi reported that eclipses were re-occurring in 
  excellent agreement with the ephemeris (vsnet-campaign-dn 1129, 1127).  
  On August 8 and 9, the general fading has almost stopped and the 
  beat phenomenon of ~4 d modulation seems to be observed 
  (vsnet-campaign-dn 1133, 1134, 1139, 1151, 1188).  The secondary humps 
  were further evolved (vsnet-campaign-dn 1141, 1142, 1146, 1147, 1150, 
  1151, 1152, 1153, 1154).  On August 10, the secondary humps became 
  further stronger and almost equivalent as those on August 9 
  (vsnet-campaign-dn 1156, 1157, 1158, 1163, 1177).  The eclipses were 
  weak at that time (vsnet-campaign-dn 1155, 1167).  T. Kato commented 
  that it may be possible that the unique profile was caused by the 
  somwhow enhanced early superhumps at this stage (vsnet-campaign-dn 1163).  
  On August 11, two humps gradually merged into single-peaked superhumps 
  (vsnet-campaign-dn 1169, 1179, 1192, 1193).  The eclipses were again 
  appeared since August 10 and became deeper on August 11 
  (vsnet-campaign-dn 1170, 1181, 1184).  The depth of the eclipses were 
  much variable with time (vsnet-campaign-dn 1185, 1186).
    The superhump period was revised and the most recent value is 
  0.057194 +/- 0.000015 d (vsnet-campaign 1091, 1092, 1093, 
  vsnet-campaign-dn 1143, 1188).

    Time-series observations by S. Kiyota is available in 
  [vsnet-campaign-data 72].  M. Richmond performed a number of 
  time-series observations and provided the data on his web (see below, 
  vsnet-campaign-dn 1119, vsnet-campaign-dn 1128, 1135, 1137, 1165, 1166, 
  1180, 1187).  He further reported that there are some sharp dips in 
  the B-band right curve, which are also observed by G. Masi and the other 
  observations (vsnet-campaign-dn 1138, 1136, 1135).

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

    S. Otero reported that delta Sco reached a new peak of V=1.74.  
  The object may show fading since this week (vsnet-campaign-be 138).

  KL Dra		(RA = 19h24m38s.14, Dec = +59d41'47".1)

    G. Masi reported that it was at about Rc=17.5mag on August 11, 
  which tells the outburst was still not faded (vsnet-campaign-dn 1172).

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

    A new outburst of 15.4mag was detected by G. Poyner on August 9 
  (vsnet-campaign-dn 1161).

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

    The outburst was faded (vsnet-campaign-dn 1105).

  V2274 Cyg		(RA = 20h07m17s.94, Dec = +36d04'37".2)

    R. Novak reported that this nova showed sinusoidal short-term 
  modulations (vsnet-campaign-nova 426, vsnet-campaign 1064).
  He performed period analysis and reported about 0.30d period 
  with 0.1mag amplitude (vsnet-campaign-nova 427).  The current 
  magnitude is around 13.8mag (vsnet-campaign-nova 428, 429).

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

    The object remains faint state (vsnet-campaign-blazar 220).

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

    The strong activity is still seen around 14mag (vsnet-campaign-dn 

  V1548 Aql		(RA = 19h07m28s.42, Dec = +11d44'45".8)

    The object was brightening to about 13.5mag during the last 
  week (vsnet-campaign-nova 430).

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

    The object is still very active around 13mag (vsnet-campaign 1095).

*** Future schedule ***

  AM Her and VY Scl stars campaign with the Keck I telescope 
	from August 12-14
  F. Rinwald wrote in [vsnet-campaign 1059]:
	"Many cataclysmic variables, especially AM Her and VY Scl stars, have
  erratic and poorly understood low states.  We have an observing run
  scheduled on the Keck I telescope from August 12-14, to find out why.  It
  has long been suspected that these low states may be due to starspots on
  the mass-losing star that form or move over L1 and choke off the flow.
  This idea is not without problems, however, but then that's why we want to
  get our spectra."
    They call for photometric monitorings and listed targets in 
  [vsnet-campaign 1059] and [vsnet-campaign-nl 23].
    Further information: [vsnet-campaign-nl 24]

  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:

  For more information, see [vsnet-campaign 1039]

  V446 Her campaign until September
    conducted by Matthias Schreiber, Boris Gaensicke, and Daisaku Nogami
  For more detailed information, see [vsnet-campaign-dn 918], 
  [vsnet-campaign-nova 349], or [vsnet-campaign 983]

  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 ***

  WZ Sge
    light curves presented by L. Cook:
					[vsnet-campaign-dn 1109]
    VSNET page:
                                        [vsnet-campaign-dn 1110, 1118, 1124,
						1131, 1132, 1144, 1159, 1171,
						1189, vsnet-campaign 1075]

    Nightly averaged magnitude by VSNET team, see [vsnet-campaign-dn 1164]

    light curves presented by G. Masi:
					[vsnet-campaign 1071, 
					 vsnet-campaign-dn 1123, 1130, 1141, 
						1167, 1173, 1179]    

    Time-series data by M. Richmond:
					[vsnet-campaign-dn 1126,1135]
					[vsnet-campaign-dn 1128]
					[vsnet-campaign-dn 1135]
					[vsnet-campaign-dn 1176]
    Web page for WZ Sge by M. Richmond:
					[vsnet-campaign-dn 1176]
    Light curve on B. Martin's page:
					[vsnet-campaign-dn 1174]

    T. Vanmunster's web page for WZ Sge:
					[vsnet-campaign-dn 1177, 1192]

  OY Car

    eclipse ephemeris, see [vsnet-campaign 1067].

  V2274 Cyg
    light curves presented by R. Novak:
					[vsnet-campaign-nova 427]

    CCD image by T. Scarmato, see [vsnet-image 58]
					[vsnet-campaign 1094]

  Salvo Massaro's Software for supernovae research
	see, [vsnet-campaign-sn 213].

(This summary can be cited.)	

Makoto Uemura

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