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[vsnet-campaign-news 150] Extremely important superoutburst of IY UMa
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Extremely important superoutburst of IY UMa
-- Deeply Eclipsing SU UMa-type Dwarf Nova
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We have received announcements from Wolfgang Kriebel, Pavol A. Dubovsky
and Jochen Pietz that the deeply eclipsing SU UMa-type dwarf nova IY UMa
(TmzV85) is undergoing an outburst. The outburst has been expected by the
VSNET Collaboration team, and we have already received and obtained most
important pre-superoutburst and early superoutburst observations. The CCD
observation by Lew Cook, as well as visual follow-up observations, has
revealed the emergence of superhumps! The overall light curve of the
first night resembles that of DV UMa (another eclipsing SU UMa-type
dwarf nova) on the first night of the 1999 superoutburst.
The superhump structure and eclipses are expected to be rapidly evolving!
A summary of early observations:
YYYYMMDD(UT) mag observer
20020507.878 136 (Wolfgang Kriebel)
20020507.887 138 (Pavol A. Dubovsky)
20020507.890 140C (Jochen Pietz)
20020507.933 137 (Hazel McGee)
20020507.942 132 (Timo Kinnunen)
20020507.950 136 (Timo Kinnunen)
20020507.951 137 (Timo Kinnunen)
20020507.956 132 (Timo Kinnunen)
20020507.960 133 (Timo Kinnunen)
20020507.965 135 (Timo Kinnunen)
20020507.969 136 (Timo Kinnunen)
20020507.976 141 (Timo Kinnunen)
20020507.978 143 (Timo Kinnunen)
20020507.978 142 (Timo Kinnunen)
20020507.981 141 (Timo Kinnunen)
20020507.982 140 (Timo Kinnunen)
20020507.983 138 (Timo Kinnunen)
20020507.983 136 (Timo Kinnunen)
20020507.985 135 (Timo Kinnunen)
20020507.987 134 (Timo Kinnunen)
20020507.989 135 (Timo Kinnunen)
20020508.115 136 (Mike Simonsen)
20020508.126 138 (Mike Simonsen)
20020508.128 137 (Mike Simonsen)
20020508.131 136 (Mike Simonsen)
20020508.131 136 (Mike Simonsen)
20020508.132 136 (Mike Simonsen)
20020508.133 136 (Mike Simonsen)
20020508.135 137 (Mike Simonsen)
20020508.137 136 (Mike Simonsen)
20020508.140 136 (Mike Simonsen)
20020508.142 136 (Mike Simonsen)
20020508.143 135 (Mike Simonsen)
20020508.144 135 (Mike Simonsen)
20020508.144 135 (Mike Simonsen)
20020508.146 136 (Mike Simonsen)
20020508.151 136 (Mike Simonsen)
20020508.159 134 (Mike Simonsen)
20020508.163 134 (Mike Simonsen)
20020508.166 135 (Mike Simonsen)
20020508.171 135 (Mike Simonsen)
20020508.176 136 (Mike Simonsen)
20020508.177 136 (Mike Simonsen)
20020508.178 136 (Mike Simonsen)
20020508.188 135 (Mike Simonsen)
20020508.194 138 (Mike Simonsen)
20020508.197 140 (Mike Simonsen)
20020508.201 <142 (Mike Simonsen)
20020508.202 141 (Mike Simonsen)
20020508.203 140 (Mike Simonsen)
20020508.204 138 (Mike Simonsen)
20020508.206 138 (Mike Simonsen)
20020508.207 137 (Mike Simonsen)
20020508.208 135 (Mike Simonsen)
20020508.209 135 (Mike Simonsen)
20020508.210 135 (Mike Simonsen)
20020508.212 135 (Mike Simonsen)
Please continue your observations to completely follow (first time
in the history) of this very favorably situated (presumable) superoutburst!
In addition to usual time-series photometry covering all phases and
eclipses, we encourage time-resolved spectroscopy, since IY UMa is known
to show prominent emission lines even during outbursts. Velocity mapping
using eclipses, as well as an attempt to detect spiral patterns would be
most vaulable.
Please report your observations to vsnet-campaig-dn (when you send raw
data, please send them to Uemura-san and Ishioka-san,
uemura@kusastro.kyoto-u.ac.jp and ishioka@kusastro.kyoto-u.ac.jp)
in order to avoid any delay.
Predicted eclipse times (UT, geocentric).
20020507 00:24:52
20020507 02:11:18
20020507 03:57:45
20020507 05:44:11
20020507 07:30:37
20020507 09:17:03
20020507 11:03:29
20020507 12:49:55
20020507 14:36:22
20020507 16:22:48
20020507 18:09:14
20020507 19:55:40
20020507 21:42:06
20020507 23:28:33
20020508 01:14:59
20020508 03:01:25
20020508 04:47:51
20020508 06:34:17
20020508 08:20:43
20020508 10:07:10
20020508 11:53:36
20020508 13:40:02
20020508 15:26:28
20020508 17:12:54
20020508 18:59:21
20020508 20:45:47
20020508 22:32:13
20020509 00:18:39
20020509 02:05:05
20020509 03:51:31
20020509 05:37:58
20020509 07:24:24
20020509 09:10:50
20020509 10:57:16
20020509 12:43:42
20020509 14:30:09
20020509 16:16:35
20020509 18:03:01
20020509 19:49:27
20020509 21:35:53
20020509 23:22:19
20020510 01:08:46
20020510 02:55:12
20020510 04:41:38
20020510 06:28:04
20020510 08:14:30
20020510 10:00:57
20020510 11:47:23
20020510 13:33:49
20020510 15:20:15
20020510 17:06:41
20020510 18:53:07
20020510 20:39:34
20020510 22:26:00
20020511 00:12:26
20020511 01:58:52
20020511 03:45:18
20020511 05:31:44
20020511 07:18:11
20020511 09:04:37
20020511 10:51:03
20020511 12:37:29
20020511 14:23:55
20020511 16:10:22
20020511 17:56:48
20020511 19:43:14
20020511 21:29:40
20020511 23:16:06
20020512 01:02:32
20020512 02:48:59
20020512 04:35:25
20020512 06:21:51
20020512 08:08:17
20020512 09:54:43
20020512 11:41:09
20020512 13:27:36
20020512 15:14:02
20020512 17:00:28
20020512 18:46:54
20020512 20:33:20
20020512 22:19:47
20020513 00:06:13
20020513 01:52:39
20020513 03:39:05
20020513 05:25:31
20020513 07:11:57
20020513 08:58:24
20020513 10:44:50
20020513 12:31:16
20020513 14:17:42
20020513 16:04:08
20020513 17:50:35
20020513 19:37:01
20020513 21:23:27
20020513 23:09:53
20020514 00:56:19
20020514 02:42:45
20020514 04:29:12
20020514 06:15:38
20020514 08:02:04
20020514 09:48:30
20020514 11:34:56
20020514 13:21:22
20020514 15:07:49
20020514 16:54:15
20020514 18:40:41
20020514 20:27:07
20020514 22:13:33
20020514 23:59:59
20020515 01:46:26
20020515 03:32:52
20020515 05:19:18
20020515 07:05:44
20020515 08:52:10
20020515 10:38:37
20020515 12:25:03
20020515 14:11:29
20020515 15:57:55
20020515 17:44:21
20020515 19:30:47
20020515 21:17:14
20020515 23:03:40
20020516 00:50:06
20020516 02:36:32
20020516 04:22:58
20020516 06:09:24
20020516 07:55:51
20020516 09:42:17
20020516 11:28:43
20020516 13:15:09
20020516 15:01:35
20020516 16:48:01
20020516 18:34:28
20020516 20:20:54
20020516 22:07:20
20020516 23:53:46
20020517 01:40:12
20020517 03:26:39
20020517 05:13:05
20020517 06:59:31
20020517 08:45:57
20020517 10:32:23
20020517 12:18:49
20020517 14:05:16
20020517 15:51:42
20020517 17:38:08
20020517 19:24:34
20020517 21:11:00
20020517 22:57:26
20020518 00:43:53
20020518 02:30:19
20020518 04:16:45
20020518 06:03:11
20020518 07:49:37
20020518 09:36:03
20020518 11:22:30
20020518 13:08:56
20020518 14:55:22
20020518 16:41:48
20020518 18:28:14
20020518 20:14:40
20020518 22:01:07
20020518 23:47:33
20020519 01:33:59
20020519 03:20:25
20020519 05:06:51
20020519 06:53:17
20020519 08:39:44
20020519 10:26:10
20020519 12:12:36
20020519 13:59:02
20020519 15:45:28
20020519 17:31:54
20020519 19:18:21
20020519 21:04:47
20020519 22:51:13
For a reference, the following VSNET page would be useful
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/tmzv85.html
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/dvuma9912.html (for comparison)
References:
Uemura et al. (2000) PASJ 52, L9 : discovery of a deeply eclipsing SU UMa-type
dwarf nova
Uemura et al. (2000) IAUC 7349 : IAUC announcement
Patterson et al. (2000) PASP 112, 1567 : binary parameters and superhumps
Rolfe et al. (2001) MNRAS 324, 529 : late superhumps
Rolfe et al. (2001) in "Astrotomography, Indirect Imaging Methods in
Observational Astronomy" p.39 : Doppler tomography
Wu et al. (2001) ApJ 549, L81 : prominent emission lines in outburst
Kato et al. (2001) IBVS 5159 : supercycle
Please enjoy the current event!
Regards,
Taichi Kato
VSNET Collaboration team
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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.
VSNET Home Page: http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/
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." or your comment to join the
collaboration team.
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