tag:blogger.com,1999:blog-25327006.post1235605949360340023..comments2024-01-02T10:55:10.607-06:00Comments on Angry Astronomer: Another Rung on the LadderJon Voiseyhttp://www.blogger.com/profile/11550625188837528980noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-25327006.post-7758419403265677102009-05-08T02:48:00.000-05:002009-05-08T02:48:00.000-05:00Hey Angry Astronomer,
I thought I'd let you know ...Hey Angry Astronomer,<br /><br />I thought I'd let you know that I finally published a book that I've been working on for the past several months. It is called "Atheism and Naturalism".<br /><br />It's $2.99 for download and $13.99 to purchase the paperback. You can buy it here:<br /><br />http://www.lulu.com/content/paperback-book/atheism-and-naturalism/6307598AIGBustedhttps://www.blogger.com/profile/03232781356086767207noreply@blogger.comtag:blogger.com,1999:blog-25327006.post-54115755600163572672009-05-07T23:26:00.000-05:002009-05-07T23:26:00.000-05:00Given that Cepheids are, by their very nature, you...Given that Cepheids are, by their very nature, young stars, they're going to be in galaxies that have a lot of gas and dust in them. Thus, you're right that dust will be a source of error. However, there's several ways to correct for the dimming and reddening caused by dust.<br /><br />One of the easiest is to just observe at longer wavelengths which are less affected by dust. Several photometric filter systems have been set up explicitly to do this. In particular, the author of this paper talks about one known as the Wesenheit system which largely independent of reddening noting that it has the smallest RMS vaules of any of the three filter systems analyzed.Jon Voiseyhttps://www.blogger.com/profile/11550625188837528980noreply@blogger.comtag:blogger.com,1999:blog-25327006.post-72382382082640582472009-05-07T22:26:00.000-05:002009-05-07T22:26:00.000-05:00What about the error associated with the dust and ...What about the error associated with the dust and other influences (e.g., gravitational) that mess with the photos on their way to our detectors?Ben Enghttps://www.blogger.com/profile/04574870632551618951noreply@blogger.com