(Outburst CCD image by Daisaku Nogami, Hida Observatory)
(Outburst CCD image by Bernerd Heathcote)
OU Vir outburst!
The eclipsing SU UMa-type dwarf nova OU Vir = LBQS 1432-0033 is reported to be in outburst. The literature position of the object is 14:35:00.14 -00:46:07.0 (J2000.0).
YYYYMMDD(UT) mag observer 20030423.229 <147 (Mike Simonsen) 20030424.596 <148 (Rod Stubbings) 20030425.599 <149 (Rod Stubbings) 20030427.522 <149 (Rod Stubbings) 20030428.203 <147 (Mike Simonsen) 20030428.569 <150 (Rod Stubbings) 20030429.453 <149 (Rod Stubbings) 20030502.603 <149 (Rod Stubbings) 20030503.276 <148 (Mike Simonsen) 20030504.145 150: (Mike Simonsen) vsnet-obs 44948 20030504.532 150 (Rod Stubbings) vsnet-outburst 5485Although current outburst may be a normal outburst, follow-up time-resolved photometry (to record both eclipses and potential superhumps) is strongly encouraged.
OU Vir is reported to have superhump and orbital periods of 0.078 and 0.073 d (Vanumunster et al. 2000, IBVS 4955; Mason et al. 2002 A&A 396, 633), but the exact periods have not yet been determined to a higher precision. Any kinds of observation will certainly improve our knowledge in this rare eclipsing SU UMa-type star.
The following VSNET pages on related objects will be useful in planning your observations:
http://www.kusastro.kyoto-u.ac.jp/vsnet/DNe/xzeri.html http://www.kusastro.kyoto-u.ac.jp/vsnet/DNe/dvuma9912.html http://www.kusastro.kyoto-u.ac.jp/vsnet/DNe/tmzv85.html http://www.kusastro.kyoto-u.ac.jp/vsnet/DNe/htcas.html Regards, Taichi Kato VSNET Collaboration team
Dear colleagues,
We have observed OU Vir for 1.75 h (nearly equal to 1 superhump period) from 2003 May 5.4487 (UT) with 60cm refl. + unfiltered CCD at Hida observatory. Our data clearly show a fully developed superhump with an apmlitude of 0.35 mag and an 0.45-mag eclipse lasting ~13 min around May 5.516 (UT). Thus, the current outburst is evidently a superoutburst! Follow-up observations of this one of rare eclipsing SU UMa stars are encouraged!
Thank you, Mike and Rod, for your prompt reports of this outburst to VSNET!
Best regards, Daisaku Nogami
OU Vir: superhump and eclipse light curve by Bernard Heathcote
Dear Colleagues,
We have received a preliminary light curve of OU Vir from Bernard Heathcote. The light curve clearly shows sharp eclipses and superhumps, whose phasing relative to Hida observation (Nogami-san) is consistent with the superhump period excess.
More detailed analysis (timing and period analysis) will be reported after receiving full observations.
Please keep your close eye on this fantasitic object!
Regards, Taichi Kato VSNET Collaboration team
OU Vir eclipse ephemeris
Dear Colleagues,
We have received full data from Bernard Heathcote. Combined with the Hida data, we have been able to calculate the following eclipse ephemeris. The period is still preliminary, and we have not much extended the ephemeris.
(Times are UT, geocentric). 20030503 01:01:22 20030503 02:46:06 20030503 04:30:50 20030503 06:15:33 20030503 08:00:17 20030503 09:45:01 20030503 11:29:44 20030503 13:14:28 20030503 14:59:12 20030503 16:43:55 20030503 18:28:39 20030503 20:13:23 20030503 21:58:06 20030503 23:42:50 20030504 01:27:34 20030504 03:12:17 20030504 04:57:01 20030504 06:41:45 20030504 08:26:28 20030504 10:11:12 20030504 11:55:56 20030504 13:40:40 20030504 15:25:23 20030504 17:10:07 20030504 18:54:51 20030504 20:39:34 20030504 22:24:18 20030505 00:09:02 20030505 01:53:45 20030505 03:38:29 20030505 05:23:13 20030505 07:07:56 20030505 08:52:40 20030505 10:37:24 20030505 12:22:07 20030505 14:06:51 20030505 15:51:35 20030505 17:36:18 20030505 19:21:02 20030505 21:05:46 20030505 22:50:30 20030506 00:35:13 20030506 02:19:57 20030506 04:04:41 20030506 05:49:24 20030506 07:34:08 20030506 09:18:52 20030506 11:03:35 20030506 12:48:19 20030506 14:33:03 20030506 16:17:47 20030506 18:02:30 20030506 19:47:14 20030506 21:31:58 20030506 23:16:41 20030507 01:01:25 20030507 02:46:09 20030507 04:30:52 20030507 06:15:36 20030507 08:00:20 20030507 09:45:04 20030507 11:29:47 20030507 13:14:31 20030507 14:59:15 20030507 16:43:58 20030507 18:28:42 20030507 20:13:26 20030507 21:58:10 20030507 23:42:53 20030508 01:27:37 20030508 03:12:21 20030508 04:57:04 20030508 06:41:48 20030508 08:26:32 20030508 10:11:16 20030508 11:55:59 20030508 13:40:43 20030508 15:25:27 20030508 17:10:10 20030508 18:54:54 20030508 20:39:38 20030508 22:24:22 20030509 00:09:05 20030509 01:53:49 20030509 03:38:33 20030509 05:23:16 20030509 07:08:00 20030509 08:52:44 20030509 10:37:28 20030509 12:22:11 20030509 14:06:55 20030509 15:51:39 20030509 17:36:23 20030509 19:21:06 20030509 21:05:50 20030509 22:50:34 20030510 00:35:17 20030510 02:20:01 20030510 04:04:45 20030510 05:49:29 20030510 07:34:12 20030510 09:18:56 20030510 11:03:40 20030510 12:48:24 20030510 14:33:07 20030510 16:17:51 20030510 18:02:35 20030510 19:47:19 20030510 21:32:02 20030510 23:16:46 Regards, Taichi Kato VSNET Collaboration team
Possible outburst of 1432-0033
Rod Stubbings reports (vsnet-obs 20556) that the poorly known cataclysmic variable 1432-0033 may be in outburst. Previous CCD measurements by M. Iida are also listed below, indicating the non-existence of a normally 15-mag star at the position.
YYMMDD(UT) mag observer 960409.556 <173 (M. Iida) 960410.556 <173 (M. Iida) 960422.553 <180 (M. Iida) 960606.528 <165 (M. Iida) 990510.446 150 (R. Stubbings) 990510.635 150 (R. Stubbings)The object is located at 14h 32m 25s.88, -00o 33' 00".9 (J2000), the reported quiescent magnitude being 18.5. Confirmatory and follow-up observations are highly urged.
The equinox refers to B1950.0. The precessed J2000 position is
14h 35m 00s.08, -00o 46' 06".0 (J2000.0)
Regards, Taichi Kato
LBQS 1432-0033 (UG)
This CV is currently undergoing its second ever recorded outburst. On unfiltered CCD images taken with the IRO the object is faint on Apr. 4.378 UT, rising on Apr. 5.376 UT, and at mag 14-15 on Apr. 6.378 UT (more accurate results hopefully before Monday).
The only previously observed outburst was detected by Rod Stubbings on 1999 May 10.446 UT at mv= 15.0 (vsnet-obs 20556, vsnet-alert 2965). That outburst lasted at least 10 days. Since no time-resolved photometry was attempted it is not known whether the 1999 May event was a long outburst of an SS Cyg-type dwarf nova or a supermaximum.
Astrometry by Arne Henden: 14:35:00.24 -00:46:05.8 (J2000.0) A sequence by him is available, too.
Regards, Patrick(vsnet-alert 4573)
Re: 1432-0033 rare outburst (Pearce)
Taichi
In response to Patrick's alert, please find below my last few observations of 1432-0033.
1432-0033 20000402.7986 <150 PEA 1432-0033 20000405.7889 <150 PEAUnfortunately I was clouded out last night, so not able to confirm any brightening.
Regards Andrew Pearce Western Australia
1432-0033 outburst
The dwarf nova 1432-0033 is reported to be in outburst. The present outburst is the first one since 2000 April, when the object was reported as bright as mv=13.0 (A. Pearce).
YYYYMMDD(UT) mag observer 20000504.560 <138 (T. Watanabe) 20000624.419 149 (R. Stubbings) 20000624.458 149 (R. Stubbings)Patrick Schmeer's comment in [vsnet-alert 4571]:
Dear colleagues,
I'm observing the dwarf nova 1432-0033 in response to the recent outburst reported by R. Stubbings (VSNET-ALERT 5030), using the 0.35-m f/6.3 telescope with unfiltered ST-7 CCD of CBA Belgium Observatory. Also running my "real-time" light curve generator, allowing on-the-fly CCD data reduction and light curve visualisation.
The light curve clearly shows a superhump-like profile with an amplitude of about 0.6 mag. It's very difficult to determine the period of the signal (given the noise due to the low altitude of the object). A guess, looking at the light curve on screen, yields a value of approx. 0.07 d.
In Astrophys. J. Sup. 78, 409, 1992, Berg et al. mentioned this object as an emission-line CV, with a "resemblance to HT Cas and U Gem". The object is located at 14h32m25.88s, -00d33'00".9 (J2000), with a reported quiescent magnitude of 18.5
I'll continue monitoring this object as long as possibe (but already getting very low now). Assistance from other observatories would be appreciated.
Best regards, Tonny
The object is naturally brought to the VSNET campaign program! Please continue to keep a watch! Judging from the large amplitude of superhumps, the system might be a (grazing) eclisper.
Regards, Taichi Kato
Dear colleagues,
An analysis of the 1432-0033 = Vir4 CCD data sets of CBA Belgium and CBA Pakuranga, securely has revealed the existence of eclipses in this newly detected [see VSNET-ALERT 5037] UGSU type dwarf nova. Data were obtained on June 26/27 (CBA Belgium), June 28/29 (CBA Belgium), June 29 (CBA Pakuranga) and June 30, 2000 (CBA Pakuranga).
Eclipse profiles have an average depth of 0.9 mag and a duration of approx. 15 min (visual inspection of light curve!). The orbital period of 1432-0033, derived from eclipse timings spread over the period mentioned above, is 0.0726 d. More precise values will be communicated after a detailed analysis of all available data has been carried out.
Best regards, Tonny Vanmunster (CBA Belgium) Fred Velthuis & Jennie McCormick (CBA Pakuranga)
1432-0033: eclipsing SU UMa-type in superoutburst
Dear Colleagues,
As reported by Tonny Vanumuster in [vsnet-alert 5052], the system has been confirmed to be a genuine eclipsing SU UMa-type dwarf nova, which had been suggested from quiescent spectroscopy and recent superhump amplitude [vsnet-campaign 257]. Please continue observing this object as one of the top priority targets. Probably the next (super)outbursts during the good visibility seasons will provide a great opportunity in studying the accretion disk structure, as we have got great successes in DV UMa and IY UMa. After finishing the present coverage, the VSNET Collaboration team will invoke an intenesive campaign when the next outburst is caught! (Quiesecent observations are, of course, also very welcome).
IBVS submission
(T. Vanmunster et al.)
VSOLJ past information
(in Japanese, dated 1992 July 30)
DV UMa, the 1997 April outburst
IR Com, the 1996 Mar. outburst
IR Com, the 1996 Jan. outburst (Japanese text)
IR Com, the 1997 Apr. outburst
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