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[vsnet-campaign-news 103] News fron VSNET 74
*** News from VSNET ***
A rare outburst of DO Dra was rapidly faded, and another rare
one of FS Aur occurred. WZ Sge is still active with variable
hump profiles.
For more detail information about these objects,
see below, "VSNET Weekly Campaign Summary" of the last week.
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VSNET (Variable Star Network) is an international variable star observing
network, covering various areas of novae, supernovae, cataclysmic variables
(CVs), X-ray transients, and other classical eruptive, pulsating, and
eclipsing variables. VSNET is one of invited contributing organizations
to the SkyPub AstroAlert system.
The "News from VSNET", mainly focusing on recent remarkable activities of
CVs and related systems, is issued on a weekly basis, except on occasions
of extremely urgent or transient events.
Please refer to the VSNET Home Page for more details of events and
objects listed.
VSNET Home Page: http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/
VSNET provides a number of mailing lists, on which various news and topics
are discussed. Subscriptions to the VSNET mailing lists are free of charge;
please refer to the instruction on the above page if a reader needs more
information of the list structure.
CCD observations of such targets are a relatively easy task for a 20-40cm
telescope; simply take as many CCD frames (with exposure times 10-30 sec)
as possible, spanning several hours per night. The only requirements are
the weather and your patience! If you need more help on the observing
technique, please feel free to ask on the vsnet-campaign list.
We would sincerely appreciate volunteers who would join the VSNET
Collaboration team to study the wonders of these exotic variable stars.
To join the VSNET campaign collaborative list, send an e-mail to
vsnet-adm@kusastro.kyoto-u.ac.jp (VSNET administrator)
with a line "SUBSCRIBE vsnet-campaign."
(VSNET campaign members are strongly recommended to subscribe to vsnet-alert
at the same time).
Regards,
Taichi Kato
On behalf of the VSNET administrator team
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The following was issued on October 1, 2001, as VSNET campaign circulation 1179
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
FS Aur (RA = 05h47m48s.34, Dec = +28d35'11".1)
As reported by M. Simonsen on September 29, the unusual
short-period dwarf nova FS Aur is reported to be in outburst
of 14.1mag (vsnet-campaign-dn 1657). It was still bright at
14.1mag on September 30 (vsnet-campaign-dn 1666).
SN 2001en (RA = 01h25m22s.90, Dec = +34d01'30".5)
The KAIT team discovered SN 2001en on September 26.5 when it
was mag about 17.5. It was confirmed on the next day with mag
about 17.0, when it was independently discovered by Beijing team.
The location is about 6" east and 3" south of the eastern nucleus
of the odd-shaped galaxy NGC 523. The expected maximum of the
normal SN Ia on this galaxy is mag about 15.5. The remarkable
rising trend suggests that it is quite young object
(vsnet-campaign-sn 255).
AO Oct (RA = 21h04m59s.07, Dec = -75d21'22".5)
According to astro-ph/0109402 (Woudt and Warner), AO Oct (formerly
proposed to be a WZ Sge-type star) is shown to have an orbital
period below the period gap. The object is most likely an SU
UMa-type dwarf nova. Please keep the vigil on this object
(vsnet-campaign 1176).
NSV02964 = HD45166 (RA = 06h26m20s.0, Dec = +07d58'52")
According to astro-ph/0109461, this star may be a V Sge-type
binary with a period of 0.357 d (vsnet-campaign 1777).
KR Aur (RA = 06h15m45s.05, Dec = +28d34'16".0)
As reported by several observers during the last week, KR Aur
is in bright state at around 13.8mag (vsnet-campaign-nl 41).
(continuous targets)
DO Dra (RA = 11h43m38s.5, Dec = +71d41'19".1)
It was in outburst until September 25, and then, the object
rapidly faded. It was again a short outburst as previously
reported. (vsnet-campaign-ip 59, 60, 61, 62, 63,
vsnet-campaign-dn 1631, 1639, 1647, 1653, 1663).
V1548 Aql (RA = 19h07m28s.42, Dec = +11d44'45".8)
The object is steady at about 14.3mag (vsnet-campaign-nova 591).
SN 2001el (RA = 03h44m30s.57, Dec = -44d38'23".7)
The object gradually brightened to 12.7 on September 24
(vsnet-campaign-sn 252). H. Yamaoka reported that the VLT
observation revealed its type Ia SN nature. The apparent
magnitude is consistent with the expected magnitude for the
normal SN Ia (vsnet-campaign-sn 253). R. Knight reported a
brightening to 12.4mag of this SN on September 26
(vsnet-campaign-sn 254).
TY Psc (RA = 01h25m36s.87, Dec = +32d23'05".3)
The outburst still continues and the current magnitude is about
12.8mag (vsnet-campaign-dn 1632, 1640, 1646, 1651, 1658, 1667).
V4740 Sgr = Nova Sgr 2001 No. 3
(RA = 18h11m45s.82, Dec = -30d30'49".9)
The fading continues. It was now around 9.3mag
(vsnet-campaign-nova 581, 585, 587, 588, 590, 593).
MV Lyr (RA = 19h07m15s.93, Dec = +44d01'10".7)
The object is still in the bright state (vsnet-campaign-nl 39,
40). Since September 29, the object has been reported to further
brightened to 13.0mag (vsnet-campaign-nl 42, 43).
V4739 Sgr = Nova Sgr 2001 No. 2
(RA = 18h24m46s.04, -30d00'41".1)
The smooth fading continues. It seems to be 14th mag or fainter
now (vsnet-campaign-nova 584).
V2275 Cyg = Nova Cyg 2002 No. 2
(RA = 21h03m02s.00, Dec = +48d45'52".9)
The slow fading is ongoing (vsnet-campaign-nova 582, 589, 592).
Reported observations may show the fading was almost stopped
(vsnet-campaign-nova 586).
V2274 Cyg (RA = 20h07m17s.94, Dec = +36d04'37".2)
The nova may be recovered from the fade. D. Rodriguez reported
V=15.35 on September 25 (vsnet-campaign-nova 583).
WZ Sge (RA = 20h07m36s.53, Dec = +17d42'15".3)
The object is still slowly fading (vsnet-campaign-dn 1630, 1638,
1645, 1650, 1655, 1662, 1665). The international campaign is still
extensively ongoing (vsnet-campaign-dn 1636, vsnet-campaign 1178).
The profiles of hump and eclipses has rapidly changed during the
last week. The QPOs were detected on September 24. The 0.12mag
humps existed at phase 0.1 and narrow eclipses were also present
(vsnet-campaign-dn 1635). In the late 24 September the humps became
multiple profile (vsnet-campaign-dn 1633, 1637). On September 25,
humps located at phase 0.4 and sharp eclipses were not evident
(vsnet-campaign-dn 1641). On September 26, the light curve showed
double humps at phase 0.8 and 0.35 (vsnet-campaign-dn 1644).
On September 27, the amplitude of humps was again grown to 0.35-0.6
mag (vsnet-campaign-dn 1648, 1652, 1654). After the mid-September
28, the hump amplitude reduced to 0.2mag or more flatter
(vsnet-campaign-dn 1656, 1659, 1660). Since September 29, the humps
again became stronger (vsnet-campaign-dn 1664, 1668).
T. Kato reported that a combination of moving (late) superhumps
and the steady orbital structure seems to partly explain the nightly
variation of the hump structure (vsnet-campaign-dn 1643).
*** 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]
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
Nightly averaged magnitude, see [vsnet-campaign-dn 1634, 1642,
1649, 1661]
(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