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

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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

Temporal variations in space-time and progenitors of gamma ray burst and millisecond pulsars

A time varying space-time metric is shown to be a source of electromagnetic radiation. The post-Newtonian approximation is used as a realistic model of the connection between the space-time metric and a time varying gravitational potential. Large temporal variations in the metric from the coalescence of colliding black holes and neutron stars are shown to be possible progenitors of gamma ray burst and millisecond pulsars.Comment: Accept by International Journal of Modern Physics