VW Hyi multiwavelength campaign - 2018

American Association of Variable Star Observers (AAVSO)
Mon, 08/06/2018 - 19:16

AAVSO Alert Notice 646 announces a multiwavelength campaign underway on the UGSU VW Hyi. Please see the notice for details and observing instructions.

Many thanks, and good observing,

Elizabeth O. Waagen, AAVSO HQ

Variable Stars South (VSS)
Shape of the lightcurve of VW Hyi

I decided to enter this campaign as something totally new to me - an SU UMa-type dwarf nova. Being in the southern hemisphere gives me an advantage. Last night I was able to observe VW Hyi from around 30 degrees elevation till daylight stopped obs before a meridian flip. I hope as VW Hyi rises earlier and earlier, I will be able to get a longer lightcurve.

If I can manage to uploadĀ  a graph of the lightcurve, I would be interested in feedback. The minima appear to be very messy. Is this a characteristic of such stars, or should I be attempting to increase exposure length?

A second question concerns transformed data. I have not been able to establish my transformation coeefificents as different southern Landolt fields give different figures. Nevertheless, I am using the ensemble photometry regime in the software MPO Canopus and observe through a V filter. Canopus uses the V values of my comparison stars to work out an absolute V value. The author of the software describes this as a "hybrid" method. Is this method acceptable for this campaign?

File upload