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[vsnet-campaign 917] VSNET Weekly Campaign Summary
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
Nova Aql 2001 (RA = 19h07m28s.42, Dec = +11d44'45".8)
= TAV J1907+117
According to THE ASTRONOMER Electronic Circular No 1633,
M. Collins discovered a variable object, TAV J1907+117.
The object was reported to be at mag 10.9 on May 11.99 UT
(vsnet-campaign 900, 901, 902, 903). IAUC 7627 announced
the object as possible nova in Aql (vsnet-campaign 905),
and then, C. Benn et al. took a spectrum with the 4.2-m William
Herschel Telescope on May 17 and confirmed its nova nature
(vsnet-campaign-nova 307). E. Schweitzer reported that D. Proust
also confirmed it through a spectrum on the 193mm OHP telescope
on May 18 (vsnet-campaign-nova 311).
M. Uemura, T. Kato, and H. Yamaoka reported a faint star of
r=18.7 exists on DSS images within 0".5 of the position of the
nova (vsnet-campaign-nova 308). Pre-discovery observations
reported by K. Kanatsu and K. Takamizawa (vsnet-campaign-nova 301,
302, 304) show that the object has already brightened since
February 26 2001 and a long premaximum halt and a sharp peak,
as observed in V723 Cas and DO Aql (vsnet-campaign-nova 306).
T. Kato reported that, in spite of the long-lasting premaximum
halt, the decline rate may be unexpectedly rapid as reported
on May 18-19 (vsnet-campaign 909), but N. James reported that
his observations show no prompt decline trend (vsnet-campaign-nova 313).
The current magnitude is about 13.5mag (vsnet-campaign-nova 305,
309, 310, 314, 316), and seems to rather steady now.
AL Com (RA = 12h32m25s.90, Dec = +14d20'42".5)
As S. Kerr reported in [vsnet-outburst 2251] on May 18, the
WZ Sge-type dwarf nova AL Com is undergoing a rare outburst
(~13.3mag). The last outburst of AL Com was observed in 1995
April (vsnet-campaign 906, 907). The Kyoto team (R. Ishioka, et al.)
performed a time-series observation on May 18 and yielded the
light curve which shows a rapid (3.0mag/d) brightening and small
hump-like features which may be the birth of "early superhumps"
(vsnet-campaign 908). The light curve on May 19 taken by the
Kyoto team shows the growth of early superhumps (vsnet-campaign 909,
911). T. Kato performed period analysis of them and reported
the best period is very slightly shorter than the orbital period,
which may imply the first indication of "negative superhumps"
in the earliest stage of WZ Sge-type superoutburst (vsnet-campaign 912).
P. Sobotka reported they performed a time-series observation on May 19
(vsnet-campaign 910). R. Novak and P. Sobotka also reported the
detection of similar modulations (vsnet-campaign-dn 796).
The Kyoto team took an observation also in May 20. From the
combined light curve, the hump period was calculated to be 0.0568 d
and the hump became irregular with time (vsnet-campaign-dn 795,
vsnet-campaign 916). The superoutburst is now ongoing
(vsnet-campaign-dn 792, 797).
MM Hya (RA = 09h14m13s.97, Dec = -06d47'45".0)
As reported by R. Stubbings and A. Pearce on May 14, the
SU UMa-type dwarf nova MM Hya is undergoing a rare, bright outburst.
The last superoutburst of MM Hya was observed in 2000 April.
Most of outbursts of MM Hya are superoutburst, as in SW UMa and
WZ Sge-type dwarf novae (vsnet-campaign 898). The object is
gradually fading, which indicates the outburst is a superoutburst
(vsnet-campaign-dn 778, 784, 787). B. Warner reported to VSNET
administrator team that they performed a time-series observation
on May 15, 16, and 17 with the 1.0-m telescope at the South African
Astronomical Observatory. The light curve on May 15 shows a double
humped profile and that on May 16 shows ~0.1 mag modulations with
a periodicity of 80min. On May 17, 0.3mag superhumps have appeared
(vsnet-campaign 904).
SN 2001bq (RA = 14h17m42s.14, Dec = -07d25'00".7)
A new object was found on May 17.587 UT by K. Itagaki when it was
mag 15.9 (CCD). The position is about 28" east and 2" north of the
"nucleus" of the spiral galaxy NGC 5534. SN 2001bq is superimposed
on an interacting companion. The KAIT team reports the prediscovery
magnitudes as mag about 16.0 on May 10.3 and about 15.3 on May 14.3,
and M. Schwartz reports that it was below mag about 19.5 on Apr. 29.3.
These magnitudes suggest that SN 2001bq is not a old object, probably
near (or before) its maximum light. Assuming that the resession
velocity of the host galaxy, the expected maximum of the typical
SN Ia is about 14.5, but the distance conversion from such
a small v_r is very uncertain (vsnet-campaign-sn 193).
LT Del (RA = 20h23m57s.24, Dec = +20d11'27".0)
The symbiotic star LT Del has rapidly brightened, as reported by
M. Reszelski. The last major brightening was observed in 1994.
The current magnitude is about 12.8mag (vsnet-campaign 899).
V503 Cyg (RA = 20h27m15s.61, Dec = +43d41'45".5)
An superoutburst started since May 17 and still continues
(vsnet-campaign-dn 793).
IP Peg (RA = 23h23m08s.7, Dec = +18d24'59".1)
As reported by H. McGee, the eclipsing dwarf nova IP Peg is now
in outburst (vsnet-campaign 915).
omega CMa (RA = 07h14m48s.70, Dec = -26d46'22".1)
S. Otero reported that the GCAS variable, omega CMa is brightening
since March 2001. Its mean brightness has also risen from 4.1 to
3.9. He noticed that Balona et al. (1999) tells that the amplitudes
are larger in seasons when the mean brightness is higher, and
such situation may be similar to delta Sco (vsnet-campaign-be 129).
(continuous targets)
SN 2001bg (RA = 08h35m18s.86, Dec = +28d28'05".8)
The object remains at around 13.7mag (vsnet-campaign-sn 187, 194).
SN 2001bf (RA = 18h01m33s.99, Dec = +26d15'02".3)
This SN seems to be at peak (vsnet-campaign-sn 189, 195).
Z Cha (RA = 08h07m16s.29, Dec = -76d32'20".9)
The normal outburst was terminated as reported on May 14
(vsnet-campaign-dn 780).
V803 Cen (RA = 13h23m44.5s, Dec = -41d44'30".1)
The strong oscillation continues (vsnet-campaign-dn 779, 788,
790). Observations on May 16-20 may show small brightening
(vsnet-campaign-dn 801).
3C 279 (RA = 12h56m11s.1, Dec = -05d47'20")
The bright state continues (vsnet-campaign-blazar 197).
CR Boo (RA = 13h48m55s.42, Dec = +07d57'30".3)
The bright state continued until May 16, and then the object
became fainter (vsnet-campaign-dn 786, 789, 791, 794).
V445 Pup (RA = 07h37m56s.88, Dec = -25d56'59".1)
The current magnitude is around 10.4 and rather steady
(vsnet-campaign-nova 300, 317).
Delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")
The object is still bright (vsnet-campaign-be 127, 130).
S. Otero reported small correction for his past reported
magnitude due to the variability of lambda Sco (vsnet-campaign-be 128).
U Gem (RA = 07h55m05s.55, Dec = +22d00'09".2)
The outburst was terminated (vsnet-campaign-dn 782).
IX Dra (RA = 18h12m32s.2, Dec = +67d04'41")
M. Reszelski's observations show IX Dra again experienced an
outburst on May 14 at magnitude of 15.6 (vsnet-campaign-dn 785).
After faded, another outburst of 15.6mag was reported on May 19
by M. Reszelski (vsnet-campaign-dn 798).
DI UMa (RA = 09h12m22s.16, Dec = +50d49'39".1)
M. Reszelski reported an outburst of 15.5mag on May 19
(vsnet-campaign-dn 799).
RX J1155.4-5641 (RA = 11h55m27.6s, Dec = -56d41'48")
The fading from the outburst was reported in the last week
(vsnet-campaign-dn 781).
SN 2001ay (RA = 14h26m17s.00, Dec = +26d14'55".8)
This SN is gradually fading now (vsnet-campaign-sn 190, 196).
SN 2001X (RA = 15h21m55s.46, Dec = +05d03'43".1)
The object remains at about 15.0mag (vsnet-campaign-sn 191).
MV Lyr (RA = 19h07m15s.93, Dec = +44d01'10".7)
The object is now very faint. G. Poyner reported it is at
about 16.5mag on May 12 (vsnet-campaign-nl 21).
CI Aql (RA = 18h52m03.6s, Dec = -01d28m38.9s)
This recurrent nova is still brighter than its quiescent state.
The current magnitude is about 14.9 (vsnet-campaign-nova 299).
*** Future schedule ***
Elizabeth and Frederick White Workshop
AGN variability across the Electromagnetic Spectrum
25 - 29 June 2001 Sydney, Australia
For more information, see [vsnet-campaign-blazar 168].
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 ***
V893 Sco
eclipse ephemeris, see [vsnet-campaign-dn 783]
V1493 Aql
sequence presented by B. Skill, see [vsnet-campaign-nova 303]
AL Com
early superhump profile (gif image):
http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/AL_Com/0519.gif
VSNET page for AL Com:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/alcom0105.html
Nova Aql 2001
low resolution spectrum presented by M. Gavin:
http://home.freeuk.com/m.gavin/tanova.htm
IP Peg
eclipse ephemeris, see [vsnet-campaign 915]
Corrigendum in the last VSNET Weekly Campaign Summary:
> SN 2001bf (RA = 18h01m33s.99, Dec = +26d15'02".3)
>
> G. M. Hurst discovered a new SN, SN 2001bf. The object is
^^^^^^^^^^^^^^^^^^^^^^^
This SN was discovered by Mark Armstrong. Its discovery was reported
by Guy Hurst.
Sorry for confusion and thank you for notifications, M. Gill
(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
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