[Message Prev][Message Next][Thread Prev][Thread Next][Message Index][Thread Index]
[vsnet-campaign 1144] VSNET Weekly Campaign Summary
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-adm@kusastro.kyoto-u.ac.jp
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
VSNET Home Page