Simulating the Role of Stellar Rotation in the Spectroscopic Effects of Differential Limb Magnification

Finite-source effects of gravitationally microlensed stars have been well discussed in the literature, but the role that stellar rotation plays has been neglected. A differential magnification map applied to a differentially Doppler-shifted surface alters the profiles of absorption lines, compromising their ordinarily symmetric nature. Herein, we assess the degree to which this finite-source effect of differential limb magnification (DLM), in combination with stellar rotation, alters spectroscopically derived stellar properties. To achieve this, we simulated a grid of high-magnification microlensing events using synthetic spectra. Our analysis shows that rotation of the source generates differences in the measured equivalent widths of absorption lines supplementary to DLM alone, but only of the order of a few percent. Using the wings of H alpha from the same simulated data, we confirmed the result of Johnson et al. (2010) that DLM alters measurements of effective temperature by < 100 K for dwarf stars, while showing rotation to bear no additional effect.Comment: Accepted for publication in PASA, 7 pages, 5 figures, 1 tabl

Can a State Funded Rural Economic Development Program Positively Impact the State’s Economy? A Case Study Application using Texas Department of Agriculture’s Rural Tourism Economic Development Program

In this paper, we review the tourism impact from supported tourism events and measure their economic value to the local economy. The economic values are the result of visitor spending and extrapolated to total event attendance creates economic values from the state-supported event. Communities receiving funding were responsible for collecting visitor surveys to measure consumer spending as well as the community completing a survey to record the investment cost of the event. The results were that state support represented 14 percent of the total event investment and total event value from visitor spending was $7.8 million for 31 events. The state percent share in value represents$1.1 million and considering the program-expended funds of $147,276 there is a$7.50 return for every $1 of state funding. Economic impacts from the funds add additional value and measure total economic value to Texas. We conclude that state supported programs focusing in the area of partial marketing support can create positive return on investment value of state funding.tourism, economic development, Texas tourism, state sponsored tourism, Agribusiness, Agricultural and Food Policy, Community/Rural/Urban Development, Marketing,

Subclasses of the separable permutations

We prove that all subclasses of the separable permutations not containing Av(231) or a symmetry of this class have rational generating functions. Our principal tools are partial well-order, atomicity, and the theory of strongly rational permutation classes introduced here for the first time