Radial Velocities and Pulsation Ephemerides of 11 Field RR Lyrae Stars

We present new radial velocities, improved pulsation periods and reference epoch s of 11 field RR Lyrae ab-type variables: AS Vir, BS Aps, CD Vel, DT Hya, RV Oct, TY Gru, UV Oct, V1645 Sgr, WY Ant, XZ Aps and Z Mic. This study is based on high resolution spectra obtained with the echelle spectro graph of the 2.5-m du Pont telescope at Las Campanas Observatory. We obtained ~200 spectra per star (i.e, total of ~2300 spectra) distributed more or less uniformly throughout their pulsation cycles. Radial velocity curves and photometric lightcurves phased to our new ephemerides are presented for all program stars. In a subsequent paper, we will use these spectra to derive stellar atmospheric parameters and chemical compositions throughout the pulsational cycles, based purely on spectroscopic constraints.Comment: 28 pages, 14 figures, 5 tables. Accepted for publication in ApJ

Take one

Take One was published every two weeks and focused on short news items and announcements "for the people of University Hospital.

Initial Coin Offerings: Innovation, Democratization and the SEC

Initial coin offerings are a source of controversy in the world of startup fundraising, and their legality is, at best, an open question. Amid soaring valuations and rumors of looming SEC action, investors and issuers alike are scrambling to forge a path forward for the token-based startups of tomorrow. While issuers may soon be forced to comply with United States securities laws, the existing regime is inadequate because it does not allow startups to capture the unique benefits of coin sales and, more importantly, it does not allow eager American investors to take part in funding the world’s next generation of technology companies

Generation and Analysis of a Social Network: Hamlet

This paper examines the generation and analysis of a social network produced from Shakespeare’s play Hamlet. An XML file of Hamlet was parsed to extract the characters within the play and also identify when the characters appeared within the same scene. After parsing the speakers and the connections between characters, a network graph was generated that displayed all the characters in Hamlet, represented by nodes, and edges that represented the connections between characters as measured by their scene co-appearance. The results of the network graph were then compared to a published social network for Hamlet created by hand. The two social networks showed strong similarities in character centrality but also showed differences in the number of character nodes and edges. In addition to the case study, we present a suite of tools that provide a framework for computational analysis of future plays