[vsnet-alert 8522] V589 Her Outburst - CCD photometry on 2005, July 2/3 at CBA Belgium Observatory

[Tonny Vanmunster]

Dear colleagues,

Following Mike Simonsen's announcement of an outburst of V589 Her on 2005,
July 2.234 UT, I started an unfiltered CCD photometry session at CBA Belgium
Observatory, using a 0.35-m f/6.3 telescope and ST-7XME CCD camera. The
session started on July 2.9 UT and lasted for 3.6 hours. V589 Her was at mag
15.2 (unfiltered), and the resulting light curve does not show modulations.
There was however a fading trend (0.18 mag over the duration of the
session). I have placed the light curve on my website www.cbabelgium.com.

The current outburst therefor either is a normal outburst, or superhumps
still have to develop. Follow-up observations are recommended.

In addition to Nogami's statement below, please note that my April 2002
observations of V589 Her, during which I detected superhumps in the system,
were confirmed at that moment by Jerry Foote (CBA Utah). Full details on the
April 2002 campaign are available through my website (section 'Cataclysmic
Variables', 'CV observations 2002', 'V589 Her'). Using 841 observations from
Jerry Foote and myself, I found a superhump period of 0.0947 +/- 0.0005 d,
using the PDM technique. This turns V589 Her into a UGSU type dwarf nova
inside the so called 'period gap' ! 

Best regards,
Tonny 

Tonny Vanmunster
CBA Belgium Observatory
http://www.cbabelgium.com 
________________________________________________________
PERANSO : The Final Frontier of Period Analysis Software
http://www.peranso.com
________________________________________________________
 

-----Original Message-----
From: vsnet-campaign-bounces at ooruri.kusastro.kyoto-u.ac.jp
[mailto:vsnet-campaign-bounces at ooruri.kusastro.kyoto-u.ac.jp] On Behalf Of
Daisaku NOGAMI
Sent: Saturday, July 02, 2005 9:21 PM
To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp;
vsnet-campaign at ooruri.kusastro.kyoto-u.ac.jp
Subject: [vsnet-campaign 1580] V589 Her Outburst

Dear colleagues,

M. Simonsen reported his detection of an outburst (14.5 mag, July
2.234(UT)) of V589 Her (cvnet-outburst).  T. Vanmunster had claimed that he
detected superhumps with a period of 0.0947(5) d during the long outburst in
2002 April, but the SU UMa nature of this star has not yet been confirmed.
Observations are encouraged with the second priority, next to V4641 Sgr and
ASAS 160048-4846.2.

Best regards,
Daisaku Nogami
On behalf of the VSNET Collaboration Team