[Message Prev][Message Next][Thread Prev][Thread Next][Message Index][Thread Index]

[vsolj-alert 951] VSNET Weekly Campaign Summary

From owner-vsnet-campaign@kusastro.kyoto-u.ac.jp Wed Sep 26 00:18 JST 2001
To: vsnet-campaign
Date: Wed, 26 Sep 2001 00:18:43 +0900
From: Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>
X-Distribute: distribute [version 2.1 (Alpha) patchlevel=24]
Subject: [vsnet-campaign 1175] VSNET Weekly Campaign Summary
Content-Type: text
Content-Length: 9661

VSNET Weekly Campaign Summary

*** Last week news ***

(new targets)
  DO Dra		(RA = 11h43m38s.5, Dec = +71d41'19".1)

    P. Schmeer reported a rare outburst of DO Dra.  The object was
  11.4mag on September 24.  The last outburst of this intermediate 
  polar was first noticed on 2000 November 15 at mv= 12.4 by G. Dyck 
  (AAVSO News Flash 698)(vsnet-campaign-ip 57, 58, vsnet-campaign-dn 

  FX Cep		(RA = 21h03m12s.5, Dec = +66d10'51".2)

    As reported by G. Poyner on September 16, an outburst of FX Cep
  was reported (14.5mag; vsnet-campaign-dn 1577).

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

    K. Haseda reported that the peculiar variable star (R CrB star?)
  HadV98 has recovered to 11.7mag from the recent deep fading
  (vsnet-campaign 1171).  The recovering seems to be started since
  early September (vsnet-campaign 1172).

  SN 2001ej		(RA = 07h23m43s.23, Dec = +33d26'38".0)	  

    A. Dimai discovered SN 2001ej at 16.5mag in the course of the
  CROSS program.  The position of SN 2001ej is about 4" west and 7"
  north of the center of UGC 3829.   UGC 3829 is a colliding pair of 
  galaxies, and because the colliding galaxies is often the birth 
  place of many massive stars, they would produce the gravitational 
  collapser.  The magnitude at discovery is consistent if it is of
  this sort, but slightly brighter than the typical examples 
  (vsnet-campaign-sn 241).  IAUC 7721 informed that SN 2001ej is of 
  type Ic (or Ib) near or well before the maximum light 
  (vsnet-campaign-sn 245).

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

    B. Monard discovered SN 2001el in NGC 1148.  The object was
  discovered on September 17 at the magnitude of V=14.5.  The position 
  is about 14" west and 20" north of the center of the tilted spiral 
  galaxy NGC 1148.  NGC 1448 is slightly further but nearly as same 
  distance as Virgo cluster (vsnet-campaign-sn 242, 243).  The object 
  brightened since its discovery, and B. Monard reported 12.9mag on
  September 24 (vsnet-campaign-sn 244, 247, 248, 250).

  TY Psc		(RA = 01h25m36s.87, Dec = +32d23'05".3)

    As reported by M. Verdenet on September 20, the SU UMa-type dwarf
  nova, TY Psc is in outburst.  M. Verdenet reported 12.1mag on
  September 21 (vsnet-campaign-dn 1616).  The object remained bright
  on September 22 which strongly indicates the current outburst is a
  superoutburst (vsnet-campaign-dn 1619, 1625). 

  V893 Sco		(RA = 16h14m45s.26, Dec = -28d39'30".3)

    As reported by P. Nelson, V893 Sco experienced an outburst of
  13.5mag on September 18.  T. Kato commented that the outburst
  frequency seems to have decreased (vsnet-campaign-dn 1591).

  VY Scl		(RA = 23h29m00s.4, Dec = -29d46'45")

    Relatively large variations were observed during the last week
  (vsnet-campaign-nl 37).

(continuous targets) 
  SN 2001ed		(RA = 01h51m51s.08, Dec = +06d17'27".4)

    The spectrum obtained by the Danish 1.54-m telescope at ESO La
  Silla on Sept. 9.257 and the CfA spectrum on Sept 11.42 show that SN
  2001ed is of type Ia several weeks after maximum light.  The maximum
  was occurred around August 18 at about 14.5mag, which is coincident
  to the expected one if the recession velocity is about 3000 km/s 
  (vsnet-campaign-sn 239).

  SN 2001ef		(RA = 04h44m28s.56, Dec = +75d38'30".3)

    This SN was turned out to be of SN Ic about a week after maximum
  on September 12, which is consistent with the reported magnitudes
  (mag about 16.0 on Sept. 9-10) (vsnet-campaign-sn 239).

  SN 2001eg		(RA = 07h31m05s.91, Dec = +59d28'38".8)

     This SN was turned out to be of SN Ia several months after
  maximum (IAUC 7716)(vsnet-campaign-sn 239).

  SN 2001eh		(RA = 01h38m12s.10, Dec = +41d39'18".8)

    This SN was turned out to be of SN Ia, and its spectrum taken on
  Sept. 11 resembles to that of the overluminous SN Ia 1990N seven
  days before maximum (IAUC 7714).  The reported magnitudes (the KAIT
  discovered it independently) match to the overluminous SN Ia
  (vsnet-campaign-sn 239).

  V4740 Sgr = Nova Sgr 2001 No. 3
			(RA = 18h11m45s.82, Dec = -30d30'49".9)

    The oscillation observed the last week seems to be weakened 
  (vsnet-campaign-nova 566).  The slow fading was interrupted on
  September 16 when a sudden fading to 8th mag was reported 
  (vsnet-campaign-nova 567, 568, 569).  The fading continued 
  (vsnet-campaign-nova 571, 573, 574, 575, 576), and then, after the 
  object faded to 8.7-8.9mag, it again slightly brightened to
  8.4-8.5mag on September 23 (vsnet-campaign-nova 577).

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

    The bright state around 13.5-13.9 continues (vsnet-campaign-nl 35, 
  36, 38).

  V844 Her		(RA = 16h25m01s.69, Dec = +39d09'25".9)

    The superoutburst has been terminated, and no rebrightening was
  reported (vsnet-campaign-dn 1587, 1592, 1620).

  V4739 Sgr = Nova Sgr 2001 No. 2  
			(RA = 18h24m46s.04, -30d00'41".1)

    The fading continues, and the current magnitude of 14.2mag 
  (vsnet-campaign-nova 570).

  V2275 Cyg = Nova Cyg 2002 No. 2	
			(RA = 21h03m02s.00, Dec = +48d45'52".9)

    The object is now in slowly fading phase.  The current magnitude
  is about 11.6-11.7 (vsnet-campaign-nova 572).

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

    The object remains the faint state after the last 12-th
  re-brightening (vsnet-campaign-dn 1576, 1578, 1581, 1582, 1583,
  1586, 1589, 1590, 1598, 1603, 1604, 1609, 1615, 1618, 1623, 1627).  The 
  international campaign is still ongoing (vsnet-campaign-dn 1574,
  1575, 1583, 1595, 1607, 1608, vsnet-campaign 1170, 1174, 
  vsnet-campaign-data 84).
    The data on September 16 showed a regrowth of the hump on phase
  0.7.  Broad eclipses, or superposed hump minimum, were seen near
  phase 0 (vsnet-campaign-dn 1579).  The period (September 14 - 16) was 
  0.05760(2) d, which is significantly longer than the orbital period, 
  and even strikingly longer than the main superhump period
  (0.05719-0.05722 d) (vsnet-campaign-dn 1580).  The amplitude was
  further grown to 0.4mag on September 17 (vsnet-campaign-dn 1585, 1588).
  The phase of superhump maxima changed onto eclipses on September 18
  (vsnet-campaign-dn 1593).  G. Masi and F. Mallia reported possible
  QPOs or short-term modulations on September 19 (vsnet-campaign-dn
  1596).  A possible brightening was reported in this day
  (vsnet-campaign 1173, vsnet-campaign-dn 1600, 1601).  The large
  humps disappeared on September 20.  The light curve showed
  low-amplitude complex humps.  Eclipses also became less apparent,
  and seen as only a shallow dip-like feature (vsnet-campaign-dn 1605). 
  On September 21, the humps again became stronger.  The main hump were
  at phase 0.7-0.8.  Eclipses have become weaker (vsnet-campaign-dn
  1610, 1611, 1614 ).  The humps and eclipses were still prominent on
  September 22 (vsnet-campaign-dn 1617), and then, the amplitude of
  humps were slightly reduced on September 23 (vsnet-campaign-dn
  1621).  The profile is similar to that on September 18, which supports 
  the shortening of the beat period (vsnet-campaign-dn 1629).  Eclipses 
  were sharp with 0.35 mag amplitude (vsnet-campaign-dn 1626).  On 
  September 24, the humps were complicated and eclipses became less 
  apparent (vsnet-campaign-dn 1628).

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

    The object remains faint (vsnet-campaign-nova 578).

  V854 Cen		(RA = 14h34m49s.8, Dec = -39d33'18")

    The S. Otero's observation on September 16 indicates a possible
  fading of V854 Cen to 7.9mag (vsnet-campaign 1169).

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

    The S. Otero's observation on September 16 shows a possible small
  brightening of delta Sco (vsnet-campaign-be 143).  On September 18,
  S. Otero reported 1.83mag (vsnet-campaign-be 144).

  PKS 2155-304		(RA = 21h58m52s, Dec = -30d13'31")

    The object is still at bright state at around 12.6mag
  (vsnet-campaign-blazar 226).

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

    As reported by M. Reszelski, an outburst of 15.5mag of IX Dra was
  detected on September 19 (vsnet-campaign-dn 1599).

*** 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:

  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]

  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]

*** General information ***

  WZ Sge
    For reference of the Henden/Landolt sequence, see IBVS 5166
					(vsnet-campaign-dn 1584)
    Nightly averaged magnitude, see [vsnet-campaign-dn 1594, 1602,
    1612, 1622]
    Eclipse ephemeris, see [vsnet-campaign-dn 1613]
    Extended sequence, see [vsnet-campaign-dn 1597]

  HV Vir
    preprint by T. Kato et al., see [vsnet-campaign-dn 1606], or

  SN 2001el
    sequence by B. Monard, see [vsnet-campaign-sn 249, 251]

(This summary can be cited.)	

Makoto Uemura

VSNET Home Page

Return to Daisaku Nogami