The AFOE: A Spectrograph for Precise Stellar Radial Velocity Measurements Detection of a high-eccentricity low-mass companion to HD 89744 The Instrument The Advanced Fiber-Optic Echelle (AFOE) spectrometer is a fiber-fed, bench-mounted echelle spectrograph, located at the 1.5m (60 ) telescope of the Whipple Observatory, near Tucson, Arizona. A spectrograph is an instrument that spreads out light ...

Robert C. Duncan, University of Texas at Austin.

ECLIPSING BINARY STARS What are Binary Stars Most stars are found in groups of stars that are gravitationally bound with each other. The majority of these stars are found in binary systems which are systems of two stars in orbit around a common center of mass. One can classify binary stars based on their appearance from earth. Stars that are far enough apart to be distinguished from each other ...

RX J1856.5-3754 and 3C58: Cosmic X-rays May Reveal New Form of Matter RX J1856.5-3754 Credit: NASA/SAO/CXC/J.Drake et al. JPEG (140 k) , Tiff (880 k), PS (6.5 MB) 3C58 Credit: NASA/SAO/CXC/P.Slane et al. JPEG (164 k) , Tiff (2.2 MB), PS (6.4 MB) Chandra observations of RX J1856.5-3754 and the pulsar in 3C58 suggest that the matter in these collapsed stars is even denser than nuclear matter, the ...

Stellar Spectra across Draper (G, K, M, S, and C) and Luminosity Classes, Philip C. Keenan and Raymond C. McNeil: Ohio State University Press, Canonical Education Consultants