[vsnet-alert 23953] V528 Cam: WZ Sge-type dwarf nova

Wed Feb 12 09:06:32 JST 2020

Dear colleagues,

Further to my below message, I have obtained two additional nights of observations of V528 Cam: 2020, Feb 10/11 at CBA Extremadura Observatory, and 2020, Feb 11/12 at CBA Belgium Observatory. 

The lightcurves of Feb 10/11, and Feb 11/12 reveal the presence of (strongly developed) early superhumps, hence classifying V528 Cam as a new WZ Sge-type dwarf nova. A period analysis of both nights, using the ANOVA, Lomb-Scargle and PDM methods (Peranso), yields a combined superhump period of 0.0571 +/- 0.0003d. The object was at mag 15.9 (CV) on Feb 12th.

Observations will be sent to AAVSO, CBA and VSNET for further analysis.

Follow-up observations are highly recommended to refine the superhump period and to study its further evolution.

Best regards

Tonny

From: cba-chat [mailto:cba-chat-bounces at cbastro.org] On Behalf Of Tonny Vanmunster
Sent: maandag 10 februari 2020 11:31
To: cba-chat at cbastro.org; Taichi Kato; ALERT, VSNET; vsnet-campaign-dn at ooruri.kusastro.kyoto-u.ac.jp; vsnet-newvar at yahoogroups.com; vsnet-outburst; vsnet-outburst at yahoogroups.com
Subject: (cba:chat) V528 Cam: new SU UMa-type dwarf nova

Dear colleagues,

I just finished analysing my unfiltered CCD observations of V528 Cam, obtained last night (2020, Feb 09/10) at CBA Extremadura Observatory, using a 0.40-m f/5.1 telescope and SX-46 CCD camera. Sky conditions were not optimal (strong moonlight, bit hazy).

The resulting lightcurve clearly shows the presence of superhumps, with an amplitude of 0.23 mag, hence establishing V528 Cam as a new SU UMa-type dwarf nova. Looking at the structure of the superhump signal, there's still a chance that this object is a WZ Sge-type dwarf nova - future observations will need to provide clarity.

A period analysis using the ANOVA, Lomb-Scargle and PDM methods (Peranso), yields a combined superhump period of 0.0595 +/- 0.0027d. The object was at mag 15.6 (CV) on Feb 10th.

Observations will be sent to AAVSO, CBA and VSNET for further analysis.

Follow-up observations are highly recommended to refine the superhump period and to study its further evolution.

Best regards

Tonny

-- 

Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
www.cbabelgium.com <http://www.cbabelgium.com> 
www.peranso.com <http://www.peranso.com> 