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

[vsolj-alert 945] VSNET Weekly Campaign Summary



From owner-vsnet-campaign@kusastro.kyoto-u.ac.jp Wed Aug 29 07:03 JST 2001
To: vsnet-campaign
Date: Wed, 29 Aug 2001 07:03:31 +0900
From: Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>
X-Distribute: distribute [version 2.1 (Alpha) patchlevel=24]
Subject: [vsnet-campaign 1144] VSNET Weekly Campaign Summary
Content-Type: text
Content-Length: 12265


VSNET Weekly Campaign Summary

*** Last week news ***

(new targets)
  HO Del		(RA = 20h36m55s.49, Dec = +14d03'09".4)

    M. Reszelski reported that the short-period SU UMa-type dwarf 
  nova HO Del is undergoing a rare outburst since August 27.  
  The last secure outburst detection dates back to 1996 August.  
  HO Del is of particular interest because of its short period 
  (Psh=0.0607 d), and unusual evolution of superhumps 
  (vsnet-campaign-dn 1399).  

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

    IAUC 7692 tells that A. J. S. Pereira discovered a new nova 
  of 7.6mag on August 26.  P. Schmeer reported a possible 
  quiescent object of r=17.5, b=19.4 USNO star (vsnet-campaign-nova 472).
  He also reported 8.5mag on August 27 (vsnet-campaign-nova 477).  
  A. Pereira reported 8.4mag on August 27 (vsnet-campaign-nova 478). 
  Now it is gradually fading (vsnet-campaign-nova 476, 480).


  KV And		(RA = 02h17m13s.85, Dec = +40d41'30".6)

    As reported by M. Simonsen, the SU UMa-type dwarf nova, KV And 
  is now in outburst since August 21 (vsnet-campaign-dn 1325).
  The outburst is probably superoutburst and still ongoing.  
  The object was reported to be 14.5mag on August 25 
  (vsnet-campaign-dn 1346, 1353, 1367, 1378).


  RX J1643.7+3402	(RA = 16h43m45s.1, Dec = +34d02'35")

    According to astro-ph/0108377 (Mickaelian et al., A&A in press),
  RX J1643.7+3402 is identified with a bright (V=12.6) cataclysmic 
  variable.  The likely orbital period lies in the period gap.  
  Further long-term coverage is clearly needed (vsnet-campaign 1134).


  SN 2001du		(RA = 03h33m28s.7, Dec = -36d08'32")

    R. Evans discovered a briht supernova SN 2001du on August 24.7.  
  It was discovered at about 14mag and reported that it was not 
  seen on August 23.7.  The position is about 90" west of the 
  nucleus of the bright large barred-spiral galaxy NGC 1365.  
  It superimposed on the H II region.  NGC 1365 is one of the target 
  of the key project of the Hubble Space Telescope, i.e., the 
  measurements of the Cepheid distance.  It is measured as 
  m-M = 31.31, which is approximately same as one for the Virgo cluster.  
  Thus, the typical SN Ia is expected to reach mag 12.5 
  (vsnet-campaign-sn 229).


  RX J2315.5-3049	(RA = 23h15m31s.934, Dec = -30d48'45".53)

    B. Monard reported that this peculiar short-period dwarf nova 
  (likely SU UMa type; resembling WZ Sge in quiescence) is in outburst 
  at 14.1mag since August 25 (vsnet-campaign-dn 1385, 1403).


  V630 Cyg		(RA = 21h34m59s.21, Dec = +40d40'18".5)

    As reported by M. Reszelski, the SU UMa-type dwarf nova V630 Cyg 
  is in outburst.  It was reported to be 14.3mag on August 26 
  (vsnet-campaign-dn 1386), and the outburst continues 
  (vsnet-campaign-dn 1400).


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

    The nova has been given the above permanent designation in IAUC 7691 
  (vsnet-campaign-nova 470).  The nova reached maximum and started
  rapid decline, and then, the fading speed has become gradual 
  (vsnet-campaign-nova 440, 441, 442, 445, 446, 447, 448, 449, 450, 
  455, 456, 457, 458, 460, 461, 462, 463, 464, 465, 466, 468, 469, 
  471, 473, 476, 482).  IAUC 7687 tells that K. Hatayama independently 
  discovered this nova on August 18.625 (vsnet-campaign-nova 443, 
  vsnet-campaign-nova 444).  H. Yosida and H. Nishimura reported 
  prediscovery observations on August 18.506 and August 18.512, 
  respectively (vsnet-campaign-nova 451, 452, 467).  A prediscovery 
  image on August 18 by R. Shida has been opened (vsnet-campaign-nova 
  454).  M. Collins reported negative observations on August 17 
  (vsnet-campaign-nova 453).  Y. Watanabe's time-series observation 
  is available in [vsnet-campaign-nova 459].  


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

    The outburst is still ongoing.  The object was reported to 
  be 14.9mag on August 21 (vsnet-campaign-dn 1321).


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

    The object has repeated rapid re-brightenings (vsnet-campaign-dn 
  1306, 1323, 1326, 1339, 1345, 1352, 1359, 1366, 1376, 1382, 1401, 
  1404, vsnet-campaign 1120, 1128).  The extensive campaign is 
  still ongoing and a number of daily observation reports have been 
  announced (vsnet-campaign-dn 1307, 1317, 1320, 1324, 1327, 1328, 
  1329, 1332, 1334, 1335, 1337, 1347, 1348, 1351, 1361, 1362, 1363, 
  1377, 1380, 1387, 1390, 1391, 1393, 1402, 1407, vsnet-campaign 1122, 
  1124, 1138). 
    The object reached a minimum from the main outburst on early 
  August 20 and showed a rapid re-brightening during the latter 
  half of Aug. 20 (vsnet-campaign 1115, 1116, 1117, vsnet-campaign-dn 
  1308, 1311, 1316).  Superhumps were seen and their period during 
  the dip was 0.057003 d, 0.56% longer than the orbital period 
  (vsnet-campaign 1119).  Their period was quite stable contrary to 
  those observed during the main superoutburst (vsnet-campaign-dn 1310). 
  Eclipses located at the peak of superhumps during the re-rising phase 
  (vsnet-campaign-dn 1312, 1117).  The object returned to 11mag on 
  August 21 (vsnet-campaign-dn 1314, 1315).  J. Pietz's data 
  showed the rising speed was 0.8mag/d (vsnet-campaign-dn 1319).
  The amplitude of superhumps was decayed to 0.03-0.04mag with 
  the re-brightening (vsnet-campaign 1121, 1125).  After the second 
  peak, the object was again rapidly faded on August 22 
  (vsnet-campaign-dn 1330, 1331, vsnet-campaign 1127).  S. Walker 
  reported it faded 0.12mag in 4 hours (vsnet-campaign 1126).  
  The amplitude of humps was growing and the profile became edge-like 
  one (vsnet-campaign 1129).  Eclipses disappeared with the fading 
  (vsnet-campaign-dn 1336).  During this rapid decline phase, 
  quasi-periodic oscillations (QPOs) were detected (vsnet-campaign-dn 
  1338).  The period was typically 3-5 min and the amplitude was about 
  0.1mag (vsnet-campaign 1130).  The object showed hints of 
  re-brightening on August 23 (vsnet-campaign 1132, vsnet-campaign-dn 
  1343, 1349).  In early August 23, humps (0.3mag) and eclipses 
  (0.1mag depth ) became prominent (vsnet-campaign 1133, 1135, 
  vsnet-campaign-dn 1341, 1350) and QPOs were less prominent 
  (vsnet-campaign-dn 1348).  The period of humps on August 23 was 
  reported to be 0.05716, well longer than the orbital period 
  (vsnet-campaign-dn 1344).  The peak of the second re-brightening 
  was observed on August 24.  The magnitude was brighter than that 
  seen in the first one (vsnet-campaign 1136).  The object then 
  again showed rapid fading.  Doule-peaked humps were reported during 
  the onset of this fading (vsnet-campaign-dn 1360).  The fading rate 
  was similar to that in the first re-brightening (vsnet-campaign 1137).  
  The bottom of this fading was reported to be 12.0mag, which may be 
  brighter than that in the first one (vsnet-campaign 1139, 
  vsnet-campaign-dn 1365).  The humps were less intensive 
  (vsnet-campaign-dn 1368, 1369).  On August 25, time-series 
  observations showed new humps at phases completely different from
  the previous superhumps.  This phenomenon may be some sort of 
  "late superhumps".  The modulations of the period of ~20min were 
  also newly revealed (vsnet-campaign 1140, 1141, vsnet-campaign-dn 
  1371).  The third re-brightening was then reported on August 26 
  (vsnet-campaign-dn 1372, 1373, 1375).  There were two humps in 
  one orbital period and eclipses were less prominent (vsnet-campaign-dn 
  1392, 1396).  After the peak, a rapid fading was again started 
  (vsnet-campaign 1142, vsnet-campaign-dn 1383).  During the rapid 
  fading phase, the QPOs were again observed on August 27 
  (vsnet-campaign 1143).  The fading continued until early August 28 
  (vsnet-campaign-dn 1394).  Period analysis of the August 27 data 
  showed a period of 0.05691d, which is closer to the orbital period 
  (vsnet-campaign-dn 1397).  Most recently, J. Pietz reported the 
  fourth re-brightening seems to be started on late August 28 
  (vsnet-campaign-dn 1406).
     A. Henden reported the UBVRI magnitudes and accurate position 
  of the companion about 7 arcsec west of WZ Sge (vsnet-campaign-dn 
  1309, 1313).  E. Kuulkers commented that the only big difference 
  between the current and the last outburst is that the main outburst 
  lasted about 5 days longer during the 1978 outburst (vsnet-campaign-dn 
  1388).  S. Kiyota's time-series data on August 20, 22, and 24 are 
  available at [vsnet-campaign-data 75, 78, and 81].  Y. Sano's data 
  on august 21 is available at [vsnet-campaign-data 76, 77, 79].  
  T. Hynek's data is available at [vsnet-campaign-data 80].


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

    The long outburst continued until around August 23, and then, 
  faded (vsnet-campaign-dn 1322, 1354).


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

    On August 26, an outburst of 15.9mag was reported by M. Reszelski 
  (vsnet-campaign-dn 1381).

 
  V503 Cyg		(RA = 20h27m15s.61, Dec = +43d41'45".5)

    The outburst seems to be terminated around August 23 
  (vsnet-campaign-dn 1340).


  delta Sco

    S. Otero reported that delta Scorpii is fading and the outburst is
  already past maximum as expected from the ephemeris.  The object 
  was reported to be 1.86mag on August 27.929 (vsnet-campaign-be 139).


*** 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]


  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 
	Conference
	September 5-7, 2001
    For more information, see [vsnet-campaign-xray 66]


*** General information ***

  Nova Cyg 2001 no. 2
    prediscovery image by R. Shida:
	http://photos.yahoo.com/rypers
					[vsnet-campaign-nova 454]
  Nova Sgr 2001 no. 2
    photometry from IAUC 7692, see [vsnet-campaign-nova 474, 475]

  WZ Sge
    About nearby companion, see [vsnet-campaign-dn 1309, 1313, 1318, 1333, 
	1356, 1357, 1358]
    Nightly averaged magnitudes, see [vsnet-campaign 1123, 
	vsnet-campaign-dn 1342, 1355, 1379, 1398].
    Light curve presented by T. Vanmunster:
	http://vsnet.lunarpages.com/cbabelgium
					[vsnet-campaign 1125]
    Time-series photometry on August 22 by M. Richmond and S. Davis:
	http://spiff.rit.edu/richmond/ritobs/aug22_2001/aug22_2001.html
					[vsnet-campaign-dn 1329]
	http://spiff.rit.edu/richmond/ritobs/aug25_2001/aug25_2001.html
	http://spiff.rit.edu/richmond/ritobs/aug25_2001/wzsge_aug25ut.dat
					[vsnet-campaign-dn 1364]
	http://spiff.rit.edu/richmond/ritobs/aug28_2001/aug28_2001.html
					[vsnet-campaign-dn 1405]
    U-band light curve by A. Henden:
	http://ftp.nofs.navy.mil/pub/outgoing/aah/phot/wzsgeuh.gif
					[vsnet-campaign-dn 1333]
	http://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/wzsge.bright.dat
					[vsnet-campaign-dn 1389]
    QPO and general humps light curve by VSNET team:
	http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/wzsge01.html
					[vsnet-campaign 1131, 
					vsnet-campaign-dn 1384, 1395]
    Light curve by T. Hynek:
	http://vsnet.mujweb.cz/www/thynek/var/WZ_Sge_010814_k.jpg
	http://vsnet.mujweb.cz/www/thynek/var/WZ_Sge_010814_s.jpg
					[vsnet-campaign-data 80]
    Light curve by L. Cook:
	http://vsnet.geocities.com/lcoo/wzsge.htm
					[vsnet-campaign-dn 1372, 1374]
    eclipse ephemeris, see [vsnet-campaign-dn 1370].

  "Bright Supernova" page presented by D. W. Bishop (also SN 2001du):
	http://vsnet.RochesterAstronomy.org/snimages/
	http://vsnet.ggw.org/asras/snimages/
					[vsnet-campaign-sn 228, 231]

(This summary can be cited.)	

Regards,
Makoto Uemura

VSNET Home Page

Return to Daisaku Nogami


vsnet-adm@kusastro.kyoto-u.ac.jp