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4 papers · 1 filter
Wind structure of late B supergiants I. Multi-line analyses of near-surface and wind structure in HD 199 478 (B8 Iae)
N. Markova, R. Prinja, H. Markov +4
We provide a quantitative analysis of time-variable phenomena in the photospheric, near-star, and outflow regions of the late-B supergiant (SG) HD 199478. The analysis is based pri…
Astrometric Orbits for Hipparcos Stochastic Binaries
Alexey Goldin, Valery Makarov
Taking advantage of an improved genetic optimization algorithm for fitting unconstrained Kepler orbits to the Hipparcos intermediate astrometric data, we obtain additional orbital…
The HgMn Binary Star Phi Herculis: Detection and Properties of the Secondary and Revision of the Elemental Abundances of the Primary
R. T. Zavala, S. J. Adelman, C. A. Hummel +6
Observations of the Mercury-Manganese star Phi Herculis with the Navy Prototype Optical Interferometer (NPOI) conclusively reveal the previously unseen companion in this single-lin…
ASTRA Spectrophotometer: Reduction and Flux Calibrations
Barry Smalley, Austin F. Gulliver, Saul J. Adelman
The ASTRA Cassegrain Spectrophotometer and its automated 0.5-m telescope at Fairborn Observatory in Arizona will produce a large quantity of high precision stellar flux distributio…