Good article. Thanks for the analogy of the shark's fin in describing how the brightness chart of a Cephid looks. I have wondered how scientists were able to determine if the change in a given stars brightness was due to it's "pulse" or to the fact that a planet was passing in front of it. I think there's a problem in determing thru triangulation any star that's more than 100 light years away from us. Too often I have seen different distances attributed to stars in the 100 to 1,000 light year range, depending on publication date. I just wonder how accurate that 890 light year distance to Delta Cephi is. --- On Sat, 1/15/11, Joe Bauman <josephmbauman@yahoo.com> wrote: From: Joe Bauman <josephmbauman@yahoo.com> Subject: [Utah-astronomy] Cepheids To: "Utah Astronomy" <utah-astronomy@mailman.xmission.com> Date: Saturday, January 15, 2011, 1:54 AM Hi Friends, My latest blog, about news concerning Cepheid variables and featuring a couple of great pics Patrick took, is up. It's at: http://www.deseretnews.com/blog/47/Nightly-news-astronomy.html Any comments are greatly appreciated. Thanks, Joe _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com