Age and Metallicity Estimations in Old Stellar Populations from Stromgren Photometry

We present a new technique to determine age and metallicity of old stellar populations (globular clusters and elliptical galaxies) using an iterative principal component analysis on narrow band (Str\"omgren) colors. Our technique is capable of reproducing globular cluster [Fe/H] values to 0.02 dex and CMD ages to 1.0 Gyrs. We also present preliminary results on the application of our technique to a sample of high mass, field ellipticals and low mass, cluster dwarf ellipticals. We confirm the results of earlier studies which find that globular clusters increase in metallicity with age and that age and metallicity increase with galaxy mass. However, we find that dwarf ellipticals deviate from the elliptical sequence by having little to no correlation between age and metallicity.Comment: 8 pages IAU LaTeX, 5 figures, contributing talk IAU #198 Near-Field Cosmology with Dwarf Elliptical Galaxie

Real Shock, Monetary Aftershock: The San Francisco Earthquake and the Panic of 1907

Economists have long studied the relationship between the real and monetary sectors. We examine the macroeconomic effects of the 1906 San Francisco earthquake, a shock that immediately reduced United States. GNP by 1.5-1.8 percentage points. The quake's impact manifested itself in gold flows, as British insurance companies paid their San Francisco claims out of home funds in the fall of 1906. The capital outflow prompted the Bank of England to raise interest rates and discriminate against American finance bills. British bank policy pushed the US into recession and set the stage for the 1907 financial crisis. The 1907 panic led to the formation of the National Monetary Commission whose proposals recommended the creation of the Federal Reserve. In this study, we identify the San Francisco earthquake as the shock that triggered the chain of events that culminated in the panic of 1907.

The tails in the Helix Nebula NGC 7293

We have examined a stream-source model for the production of the cometary tails observed in the Helix Nebula NGC 7293 in which a transonic or moderately supersonic stream of ionized gas overruns a source of ionized gas. Hydrodynamic calculations reveal velocity structures which are in good agreement with the observational data on tail velocities and are consistent with observations of the nebular structure. The results also are indicative of a stellar atmosphere origin for the cometary globules. Tail remnants persist for timescales long enough for their identification with faint striations visible in the nebula gas to be plausible.Comment: 7 pages, 6 figures, accepted for publication in A&

Renorming spaces with greedy bases

We study the problem of improving the greedy constant or the democracy constant of a basis of a Banach space by renorming. We prove that every Banach space with a greedy basis can be renormed, for a given \vare>0, so that the basis becomes (1+\vare)-democratic, and hence (2+\vare)-greedy, with respect to the new norm. If in addition the basis is bidemocratic, then there is a renorming so that in the new norm the basis is (1+\vare)-greedy. We also prove that in the latter result the additional assumption of the basis being bidemocratic can be removed for a large class of bases. Applications include the Haar systems in $L_p[0,1]$, $1<p<\infty$, and in dyadic Hardy space $H_1$, as well as the unit vector basis of Tsirelson space

William Baxter Harrill Family

Genealogical notes by Odell A. Harrill of the William and Sally Berryhill Baxter family, whose daughter Elizabeth Bitsy Baxter married Amos Harrill. William Baxter (1759 - 1853); Sally Berryhill Baxter (1766 - 1812)https://digitalcommons.gardner-webb.edu/fay-webb-gardner-harrill-family/1000/thumbnail.jp