Review of Essential Catholic Social Thought

Bernard V. Brady titles his textbook Essential Catholic Social Thought to indicate that his focus extends beyond documents of the Church’s magisterium, usually designated “Catholic social teaching” (CST), but his emphasis is on those documents nonetheless. I will comment on this book from my perspective as a teacher for twenty years of a course called “Catholic Social Teaching.” My course is addressed to upper-level undergraduates in a Catholic university and specifically to those majoring in international studies (though it is open to others), but I hope these comments will be helpful to anyone who is considering Brady’s book for teaching or learning Catholic social thought. Currently I use the full texts or excerpts from the texts of the official documents reprinted in O’Brien and Shannon’s Catholic Social Thought (2016), supplemented by chapters from Daniel Groody’s Globalization, Spirituality, and Justice (2015)

Using Narrow Band Photometry to Detect Young Brown Dwarfs in IC348

We report the discovery of a population of young brown dwarf candidates in the open star cluster IC348 and the development of a new spectroscopic classification technique using narrow band photometry. Observations were made using FLITECAM, the First Light Camera for SOFIA, at the 3-m Shane Telescope at Lick Observatory. FLITECAM is a new 1-5 micron camera with an 8 arcmin field of view. Custom narrow band filters were developed to detect absorption features of water vapor (at 1.495 microns) and methane (at 1.66 microns) characteristic of brown dwarfs. These filters enable spectral classification of stars and brown dwarfs without spectroscopy. FLITECAM's narrow and broadband photometry was verified by examining the color-color and color-magnitude characteristics of stars whose spectral type and reddening was known from previous surveys. Using our narrow band filter photometry method, it was possible to identify an object measured with a signal-to-noise ratio of 20 or better to within +/-3 spectral class subtypes for late-type stars. With this technique, very deep images of the central region of IC348 (H ~ 20.0) have identified 18 sources as possible L or T dwarf candidates. Out of these 18, we expect that between 3 - 6 of these objects are statistically likely to be background stars, with the remainder being true low-mass members of the cluster. If confirmed as cluster members then these are very low-mass objects (~5 Mjupiter). We also describe how two additional narrow band filters can improve the contrast between M, L, and T dwarfs as well as provide a means to determine the reddening of an individual object.Comment: 43 pages, 17 figures. Accepted for publication in the Astrophysical Journal 27 June 200