78,217 research outputs found
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 1.1 million and considering the program-expended funds of 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
- …