[Aavso-photometry] Var Her 04 period update - new run started at CBA Belgium Observatory

[Tonny Vanmunster]

Dear colleagues,

I have now also analysed my Var Her 04 (unfiltered) CCD observations of
2004, June 25/26, allowing a refinement of the (super?)hump period, reported
in my previous email. I observed Var Her 04 for 3.9 hours on June 25/26,
using a 0.35-m f/6.3 telescope, and captured 3 humps (see also
www.cbabelgium.com for the latest lightcurves). Again, there's a dip
superimposed on the hump, but this time less pronounced than during the Jun
24/25 observations. However, the hump profile itself has a clearer
signature, closer to a typical superhump profile.

Using a total of 416 observations (2 nights), I looked for periodic signals
in Var Her 04's lightcurve, using 4 different methods (in Peranso) : ANOVA,
PDM, Dworetsky and Lomb-Scargle. ANOVA, PDM and Dworestky are statistical
methods for period determination, whilest Lomb-Scargle is a Fourier method.
Yet, all four methods yield a consistent (super?)hump period value of 0.0579
+/- 0.0002 d, so we may assume that this period is already fairly accurate.

I have included the ANOVA period window on my website, as well as the Var
Her 04 light curve folded on the reported period. The phase diagram shows an
average hump amplitude of 0.14 mag.

Skies are clear again tonight (Jun 27/28), and another CCD observing run on
Var Her 04 is ongoing. Results will be communicated later.

Best regards,
Tonny Vanmunster

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