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Infrared Spectroscopy of Symbiotic Stars. VII. Binary Orbit and Long Secondary Period Variability of CH Cygni
Kenneth Hinkle, Francis Fekel, Richard Joyce
High-dispersion spectroscopic observations are used to refine orbital elements for the symbiotic binary CH Cyg. The current radial velocities, added to a previously published 13 ye…
Planetary systems around close binary stars: the case of the very dusty, Sun-like, spectroscopic binary BD+20 307
B. Zuckerman, Francis C. Fekel, Michael H. Williamson +2
Field star BD+20 307 is the dustiest known main sequence star, based on the fraction of its bolometric luminosity, 4%, that is emitted at infrared wavelengths. The particles that c…
The orbits of the quadruple star system 88 Tau A from PHASES differential astrometry and radial velocity
Benjamin F. Lane, Matthew W. Muterspaugh, Francis C. Fekel +7
We have used high precision differential astrometry from the Palomar High-precision Astrometric Search for Exoplanet Systems (PHASES) project and radial velocity measurements cover…
Masses, Luminosities, and Orbital Coplanarities of the mu Orionis Quadruple Star System from PHASES Differential Astrometry
Matthew W. Muterspaugh, Benjamin F. Lane, Francis C. Fekel +6
mu Orionis was identified by spectroscopic studies as a quadruple star system. Seventeen high precision differential astrometry measurements of mu Ori have been collected by the Pa…
New Precision Orbits of Bright Double-Lined Spectroscopic Binaries. I: RR Lyncis, 12 Bootis, and HR 6169
Jocelyn Tomkin, Francis C. Fekel
Radial velocities from the 2.1 m telescope at McDonald Observatory supplemented with radial velocities from the coude' feed telescope at KPNO provide new precise orbits for the dou…
Infrared Spectroscopy of Symbiotic Stars. IV. V2116 Ophiuchi/GX 1+4, The Neutron Star Symbiotic
Kenneth H. Hinkle, Francis C. Fekel, Richard R. Joyce +3
We have computed, based on 17 infrared radial velocities, the first set of orbital elements for the M giant in the symbiotic binary V2116 Ophiuchi. The giant's companion is a neutr…