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[vsnet-campaign-news 41] News from VSNET 41
*** News from VSNET ***
V445 Pup (Kanatsu Object) has recently be rather stationary.
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 Feb. 13, 2001, as VSNET campaign circulation 757.
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
SN 2001R (RA = 13h29m16s.93, Dec = +17d02'41".2)
The new object has discovered on the images taken by KAIT team
on Jan. 6.5, Feb. 3.5, and Feb 4.5, and it has been at mag 185:C.
The location is about 33" west and 25" south of the nucleus of
the tilted spiral(SAB(rs)bc:) galaxy NGC 5172. From the recession
velocity of NGC 5172, the expected maximum for normal SN Ia is
mag 15.4. The constant brightness for almost 1 month, however,
indicate that it would be in some plateau phase, which is typical
for some of SN II. This galaxy had produced another SN 3 years ago.
SN 1998cc was discovered at mag 18.1 before maximum. It was of
type Ib, but not followed-up well (vsnet-campaign-sn 150).
BR Lup (RA = 15h35m51s.61, Dec = -40d34'25".4)
As reported by D. Overbeek in [vsnet-outburst 1555],
the SU UMa-type dwarf nova BR Lup experienced a bright (13.2mag)
outburst on February 6. The last superoutburst was observed
in 2000 Aug (mv=13.7, Stubbings)(vsnet-campaign 752).
A rapid fading was reported on February 7 (vsnet-campaign 754).
UV Gem (RA = 06h38m44s.51, Dec = +18d16'05".6)
R. Stubbings reported on February 10 that the SU UMa-type
dwarf nova UV Gem is in outburst. Even outburst at this
magnitude can be a superoutburst (as in the 1999 December one)
(vsnet-campaign 755). The outburst was reported to be at 15.0mag
on February 11, which means the outburst continues (vsnet-campaign 756).
SN 2001T (RA = 14h32m53s.17, Dec = -12d58'43".6)
IAUC 7581 informed that SN 2001T was discovered by Bejing team
on Feb. 6.9 (mag 170:C) and appeared 0.2 mag brighter on 2 days later.
The location is about 3" east and 12" south of the nucleus of
the barred-spiral (SB(rs)bc) galaxy MCG -02-37-6. It lies between
the bar and the southern arm. From the recession velocity of
the host galaxy, the expected maximum of SN Ia is mag about 15.4
(vsnet-campaign-sn 153).
New ROSAT CVs
T. Kato showed new ROSAT CVs according to Appenzeller et al. (1998)
in [vsnet-campaign 748]. Among them, G. Tovmassian noticed that
RXJ2157.5+0855 is a magnetic CV (polar) with well defined high
and low states (vsnet-campaign 749).
(continuous targets)
V383 Vel (RA = 10h21m41s.7, Dec = -49d49'24".33")
The bright long outburst continued until Febraury 10 when
R. Stubbings reported its fading (vsnet-campaign-dn 458, 459, 462)
The current magnitude is around 14.3mag (vsnet-campaign-dn 467).
V4018 Sgr (RA = 18h25m29s.95, Dec = -28d35'09".5)
F. Williams's observations suggest the fading may have commenced
since 2000 (vsnet-campaign 753).
QW Ser (RA = 15h26m13s.99, Dec = +08d18'03".8)
The superoutburst continues. H. Iwamatsu, the Kyoto team,
performed time-series observations on February 6, 8, 10, 11
(vsnet-campaign 750, vsnet-campaign-dn 461, 465, 468).
R. Novak performed more than 5 hours run on February 11 and 12
(vsnet-campaign-dn 466, 469).
SX LMi (RA = 10h54m29s.93, Dec = +30d06'30".0)
The plateau stage of the superoutburst continued until February
6 when the Kyoto observation detected its rapid decline
(vsnet-campaign-dn 457, vsnet-campaign 751).
BF Eri (RA = 04h39m29s.62, Dec = -04d36'10".0)
The outburst was terminated on February 9 as indicated by
an E. Muyllaert's observation of <13.4mag (vsnet-campaign-dn 464).
U Gem (RA = 07h55m05s.55, Dec = +22d00'09".2)
The slightly bright state continues and the current magnitude
is 13.8-13.9 mag (vsnet-campaign-dn 463).
V445 Pup (RA = 07h37m56s.88, Dec = -25d56'59".1)
The relatively calm state continues (vsnet-campaign-nova 206,
207, 208). On February 11, the Kyoto team obtained quasi-continuous
4.5-hour high-speed photometry which yields short-term variations,
but the amplitudes were an order of 0.1 mag or less
(vsnet-campaign-nova 209).
3C 66A (RA = 02h22m39s.6, Dec = +43d02'08")
The fading continues (vsnet-campaign-blazar 141).
Delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")
The bright state continues (vsnet-campaign-be 85, 86, 87).
The current magnitude is around 1.9mag.
V803 Cen (RA = 13h23m44.5s, Dec = -41d44'30".1)
An outburst (13.5mag) was reported by A. Pearce on February 7
(vsnet-campaign-dn 460).
SN 2001B (RA = 04h57m19s.24, Dec = +78d11'16".5)
The object is gradually fading from the maximum (vsnet-campaign-sn 151).
SN 2001C (RA = 06h59m36s.10, Dec = +59d31'01".6)
The object is gradually fading (vsnet-campaign-sn 152).
The current magnitude is around 15.4C.
TV Col (RA = 05h29m25s.5, Dec = -32d49'05".2)
The last outburst was observed on January 28. On the point of
recent outburst frequency, the next one may be due, and
close monitorings are encouraged (vsnet-campaign-ip 39, 40).
*** Future schedule ***
RZ LMi campaign conducted by J. Patterson on April 2001
For more information, see [vsnet-campaign 718, vsnet-campaign-dn 429].
*** General information ***
U Gem
eclipse ephemeris, see [vsnet-campaign 747]
(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