Marshall University Music Department Presents the Marshall University Collegians

https://mds.marshall.edu/music_perf/1149/thumbnail.jp

Marshall University Music Department Presents a Faculty Recital, J.D. Folsom, Trumpet, Michael Cerveris, Piano

https://mds.marshall.edu/music_perf/1139/thumbnail.jp

Orbital parameters, chemical composition, and magnetic field of the Ap binary HD 98088

HD 98088 is a synchronised, double-lined spectroscopic binary system with a magnetic Ap primary component and an Am secondary component. We study this rare system using high-resolution MuSiCoS spectropolarimetric data, to gain insight into the effect of binarity on the origin of stellar magnetism and the formation of chemical peculiarities in A-type stars. Using a new collection of 29 high-resolution Stokes VQU spectra we re-derive the orbital and stellar physical parameters and conduct the first disentangling of spectroscopic observations of the system to conduct spectral analysis of the individual stellar components. From this analysis we determine the projected rotational velocities of the stars and conduct a detailed chemical abundance analysis of each component using both the SYNTH3 and ZEEMAN spectrum synthesis codes. The surface abundances of the primary component are typical of a cool Ap star, while those of the secondary component are typical of an Am star. We present the first magnetic analysis of both components using modern data. Using Least-Squares Deconvolution, we extract the longitudinal magnetic field strength of the primary component, which is observed to vary between +1170 and -920 G with a period consistent with the orbital period. There is no field detected in the secondary component. The magnetic field in the primary is predominantly dipolar, with the positive pole oriented approximately towards the secondary.Comment: Accepted for publication by MNRAS, 17 pages, 12 figure

On two 10th order mock theta identities

We give short proofs of conjectural identities due to Gordon and McIntosh involving two 10th order mock theta functions.Comment: 5 pages, to appear in the Ramanujan Journa

A systematic review of the relationships between principal characteristics and student achievement

This report reviews studies that have investigated the relationships between principal characteristics (including precursors, behaviors, and leadership styles) and student achievement. Only one experimental study examined a principal intervention designed to improve student achievement. It found that grade 8 students randomly assigned to have one-on-one conversations with the principal scored higher on the state English language arts test. An additional 38 quantitative and 2 mixed method studies provided mixed evidence of the relationships between principal characteristics and student achievement; 11 qualitative studies mirrored the quantitative findings