XZ Cet revisited
As I discussed in the Director's Report from the SAS/AAVSO meeting, XZ Cet is an interesting star. Available photometry, for example, shows considerable variation at the peak brightness, yet the rest of the light curve falls pretty much into place. That would imply to me some emission mechanism occurring near max. Doug Welch also called for continued monitoring of the candidate anomalous cepheid.
Therefore, I ask observers to either continue their observations of XZ Cet, or to begin observing this star. Details are given in a prior post. Also, I expect to continue my public discussion of each observer so that we can all learn from each other's mistakes or excellent techniques.
If you do a single nightly visit to XZ Cet, then I ask that you (a) use at least two filters; (b) do at least 3 sets of observations (for example, BVBVBV), take the average and standard deviation, and report that rather than the 3 individual sets. A new Windows program called Boxster is available for download on the transformation page; you should try this out or develop your own technique.
If you do time series, the best uncertainty estimator is (K-C). You can do a running average and report the standard deviation as the uncertainty for the target.
If you can transform, please do so. Again on the transformation page:
are programs to download that both calculate your coefficients and apply your coefficients.
I recommend that you use a single comparison star for now, and not ensemble, so that we can learn about transformation and apply it easiest. You can always go back and update your submissions with ensemble results if you want to later.
I will also be monitoring the EE Cep campaign, soon to be announced. Let's get some really excellent photometry this year!