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[vsnet-campaign-news 104] News from VSNET 75
*** News from VSNET ***
W. Liller discovered a nova in Centaurus. A rare outburst
of the SU UMa-type dwarf nova EF Peg is ongoing.
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 8, 2001, as VSNET campaign circulation 1181
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
Nova Cen 2001 (RA = 13h55m41s.27, Dec = -64d15'57".9)
W. Liller reported a possible nova of 8.6mag on October 1
(vsnet-campaign-nova 594, 595, 596, 602, 603, 604, 605).
A. Jones, A. Pearce, and M. Mattiazzo reported their confirmation
just after the discovery (vsnet-campaign-nova 597, 598, 600, 601).
The object is now around 9.8mag (vsnet-campaign-nova 599, 606, 609).
EF Peg (RA = 21h15m04s, Dec = +14d03'50")
As reported by E. Muyllaert in [vsnet-alert 6734], the SU UMa-type
dwarf nova EF Peg started its new rare outburst of 11.1mag on
October 3. EF Peg is a strange SU UMa-type star in the point
of its long cycle of superoutburst with a long orbital period of
near 2 hours, the edge of the "period gap" of CVs (vsnet-campaign 1180,
vsnet-campaign-dn 1674). D. Starkey's data on October 6 detected
a probable superhump, which strongly indicates the current outburst is
a genuine superoutburst (vsnet-campaign-dn 1688). The object is now
about 11.1mag and the outburst is still ongoing (vsnet-campaign-dn 1676,
1678, 1682, 1685).
SN 2001ep (RA = 04h57m00s.26, Dec = -04d45'40".2)
IAUC 7727 tells that the KAIT team discovered SN 2001ep on
October 3 (17.1mag) and 4 (16.8mag). The recession velocity of
the host galaxy NGC 1699 is measured as 3900 km/s, from which
the expected maximum of typical SN Ia is mag about 15.3
(vsnet-campaign-sn 256).
SN 2001eq (RA = 23h04m56s.78, Dec = +19d33'04".8)
IAUC 7728 tells that the KAIT reported SN 2001 first detected
on September 12 at 18.7mag. The object was 17.2mag on October 4
(vsnet-campaign-sn 257).
(continuous targets)
V1548 Aql (RA = 19h07m28s.42, Dec = +11d44'45".8)
The object rebrightened to 13.0mag on October 4
(vsnet-campaign-nova 607).
SN 2001el (RA = 03h44m30s.57, Dec = -44d38'23".7)
The object is now bright at about 12.6mag (vsnet-campaign-sn 258).
TY Psc (RA = 01h25m36s.87, Dec = +32d23'05".3)
The superoutburst was terminated around October 1 and 2
(vsnet-campaign-dn 1673).
V4740 Sgr = Nova Sgr 2001 No. 3
(RA = 18h11m45s.82, Dec = -30d30'49".9)
The slow fading continues (vsnet-campaign-nova 608, 610).
MV Lyr (RA = 19h07m15s.93, Dec = +44d01'10".7)
The object is now around 13mag (vsnet-campaign-nl 44).
WZ Sge (RA = 20h07m36s.53, Dec = +17d42'15".3)
The late superhumps are still reported, and the international
campaign is ongoing (vsnet-campaign-dn 1672, 1675, 1677, 1683,
1684). The humps were again growing on October 1 and 2
(vsnet-campaign-dn 1669, 1670). On October 3, eclipses became
prominent and then the amplitude of humps decreased
(vsnet-campaign-dn 1679). The eclipse feature has been becoming
weaker as the system faded (vsnet-campaign-dn 1680). The emergence
of humps (~0.4mag) is reported on October 7 (vsnet-campaign-dn 1686).
*** 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 1671, 1687]
Eclipse ephemeris, see [vsnet-campaign-dn 1681]
(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