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

[vsolj-alert 918] VSNET Weekly Campaign Summary

From owner-vsnet-campaign@kusastro.kyoto-u.ac.jp Tue Jul 24 06:20 JST 2001
To: vsnet-campaign
Date: Tue, 24 Jul 2001 06:20:03 +0900
From: Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>
X-Distribute: distribute [version 2.1 (Alpha) patchlevel=24]
Subject: [vsnet-campaign 1013] VSNET Weekly Campaign Summary
Content-Type: text
Content-Length: 7123

VSNET Weekly Campaign Summary
*** Last week news ***

(new targets)
  Nova Cyg 2001		(RA = 20h07m17s.94, Dec = +36d04'37".2)
	(= V2274 Cyg)

    Y. Nakamura discovered a new nova in Cygnus.  He reported that 
  the object was 11.9mag on July 13.  On DSS images, there is no 
  object above the detection limits around 4" of the reported 
  position (vsnet-campaign-nova 394).  T. Iijima performed 
  spectroscopic observation and confirmed the nova nature of the 
  object.  From the spectrum, he also reported that the object 
  could be a classical nova in the early decline stage from light 
  maximum (vsnet-campaign-nova 396).  K. Ayani, M. Gavin, M. Fujii, 
  and C. Buil also independently reported results of spectroscopy 
  and confirmed the broad emission lines (vsnet-campaign-nova 403, 
  405, 408, 410).  Prediscovery observations by A. Takao and 
  K. Kanatsu show the object was faint at least on July 12 
  (vsnet-campaign-nova 397, 398, 399).  H. Fukushima reports that 
  the object significantly brightened between July 16 and 20 
  (vsnet-campaign-nova 411).  The gradual fading is ongoing.  
  The current magnitude is about 12-13mag (vsnet-campaign-nova 401, 
  406, 412).  The permanent designation, V2274 Cyg has been given 
  for Nova Cyg 2001 (IAUC 7668) (vsnet-campaign-nova 404). 

  WZ Sge		(RA = 20h07m36s.40, Dec = +17d42'15".4)

    The prototype of WZ Sge-type dwarf nova, WZ Sge is now in 
  outburst as detected by M. Ohshima.  The Kyoto team confirmed the 
  outburst at 9.5mag on July 23 14:30 (UT) (vsnet-campaign-nova 413, 
  vsnet-campaign 1009).  The last outburst was reported on 1978 
  (vsnet-campaign-nova 414).  An observation by M. Reszelski shows 
  the object was faint on July 22.969 (vsnet-campaign 1009).
  M. Uemura reported that preliminary analysis of the Kyoto image 
  shows rapid rising of the object (vsnet-campaign 1010, 1011).  

  V405 Vul		(RA = 19h53m05s.0, Dec = +21d14'50")

    As reported in [vsnet-outburst 2520] by J. Pietz, the possible 
  SU UMa-type dwarf nova V405 Vul is in outburst (15.1mag on July 19).
  T. Kato noticed that the object is known to show variations 
  resembling superhumps, but they have unstable periods.  The other 
  similar example is V344 Ori.  These objects may represent a new 
  class of dwarf novae, which have intermediate properties between 
  SU UMa-type dwarf novae and SS Cyg-type dwarf novae (vsnet-campaign 1003).
  The possible superoutburst continues (vsnet-campaign-dn 992).

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

    M. Reszelski reported an outburst of V1504 Cyg at 14.7 mag 
  on July 21.  It is possible that the outburst is superoutburst 
  (vsnet-campaign-dn 989).  The outburst is still ongoing 
  (vsnet-campaign-dn 994).

  Brh V84 		(RA = 19h00m53s.0, Dec = +07d12'01")

    Brh V84 is identified with a ROSAT source.  This field has been 
  surveyed by MSX5C, but has no bright infrared counterpart, making 
  the identification as an SR or long-period variable unlikely.  
  Although the object may be an active Algol, this variable 
  apparently warrants further detailed study, including spectroscopy 
  (vsnet-campaign 1006).  C. Lloyd suspects that Brh V84 is more 
  likely to be a dMe (or similar) than an algol (vsnet-campaign 1007).
  T. Kato replied that the X-ray spectrum of this object is harder 
  than most of dMe stars (vsnet-campaign 1008).

(continuous targets) 
  V1141 Aql		(RA = 19h37m10s.01, Dec = +02d35'59".2)

    After the temporal fading, the object re-brightened on July 18 
  as shown in the Kyoto team observation.  This implies that the 
  outburst of July 12-13 was very likely a precursor to a superoutburst 
  (vsnet-campaign 1001).  R. Ishioka reported that possible short-term 
  modulations were seen in the light curve on July 19 (vsnet-campaign 1002).
  The superoutburst is still ongoing.  The current magnitude is 
  about 14.8mag (vsnet-campaign-dn 988, 991, 995).

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

    The brightening still continues.  The object is currently very 
  bright (13.2mag on July 21; M. Reszelski) (vsnet-campaign 1004, 1005).

  V1178 Sco		(RA = 17h57m06s.92, Dec = -32d23'05".0)

    After the modulations, the object began gradual fading.  
  The current magnitude is about 12.4-12.7mag (vsnet-campaign-nova 402).

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

    The object is fading from the bright outburst.  It has faded 
  to 14th magnitude (vsnet-campaign-blazar 216, 217).

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

    An outburst was detected by M. Reszelski at 16.6mag on July 21 
  and further brightened to 15.0mag on July 22 (vsnet-campaign-dn 993).

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

    The object again started gradual fading after some oscillations.
  It is now at around 13.6mag (vsnet-campaign-nova 407).

  TK5 Lyr		(RA = 19h17m26s.5, Dec = +37d10'41")

    The possible outburst has faded (vsnet-campaign-dn 990).

*** Future schedule ***

  EM Cyg campaign with HST on 23 - 29 July 
			(most likely 12:22-13:10 UT on July 29) 
    conducted by T. Marsh
  For more detailed information, see [vsnet-campaign 999]

  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]

  CV conference at Goettingen, 5-10 August 2001
	[vsnet-announce 15, 20]

  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 ***

  Nova Cyg 2001
    VSNET web page:
					[vsnet-campaign-nova 395]
    V-band CCD image presented by D. Buczynski:
					[vsnet-campaign-nova 400]
    Spectrum presented by M. Gavin:
					[vsnet-campaign-nova 405]
    Spectrum presented by M. Fujii:
					[vsnet-campaign-nova 408]
    Spectrum presented by C. Buil:
					[vsnet-campaign-nova 410]  
  V1494 Aql
    CCD image presented by G. Masi:

  V1548 Aql
    CCD image presented by G. Masi:

  WZ Sge
    VSNET web page:
    CCD image during the outburst presented by the Kyoto team:

    In the last VSNET Weekly Campaign Summary, we overlooked reports 
  by G. Masi which indicates no significant modulations of V589 Her 
  during the outburst [vsnet-alert 6056, 6060].
    Sorry for confusion.

(This summary can be cited.)	

Makoto Uemura

VSNET Home Page

Return to Daisaku Nogami