Douglas L. Morgan
Smithsonian Astrophysical Observatory
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The Astronomical Journal | 2015
Nancy Remage Evans; L. N. Berdnikov; Jennifer Lauer; Douglas L. Morgan; Joy S. Nichols; H. Moritz Günther; Natalya Gorynya; A. S. Rastorguev; Pawel Moskalik
We have examined high accuracy radial velocities of Cepheids to determine the binary frequency. The data are largely from the CORAVEL spectrophotometer and the Moscow version, with a typical uncertainty of
Astrophysical Journal Supplement Series | 2011
Francis A. Primini; John Charles Houck; John E. Davis; Michael A. Nowak; Ian N. Evans; Kenny J. Glotfelty; Craig S. Anderson; Nina R. Bonaventura; Judy C. Chen; Stephen M. Doe; Janet Deponte Evans; G. Fabbiano; Elizabeth C. Galle; Danny G. Gibbs; John D. Grier; Roger Hain; Diane M. Harnak Hall; Peter N. Harbo; Xiangqun (Helen) He; Margarita Karovska; Vinay L. Kashyap; Jennifer Lauer; Michael L. McCollough; Jonathan C. McDowell; Joseph B. Miller; Arik W. Mitschang; Douglas L. Morgan; Amy E. Mossman; Joy S. Nichols; David Alexander Plummer
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Proceedings of SPIE | 2006
Joy S. Nichols; Craig S. Anderson; P. J. Mendygral; Douglas L. Morgan; G. Fabbiano
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Astrophysical Journal Supplement Series | 2010
Ian N. Evans; Francis A. Primini; Kenny J. Glotfelty; Craig S. Anderson; Nina R. Bonaventura; Judy C. Chen; John E. Davis; Stephen M. Doe; Janet Deponte Evans; G. Fabbiano; Elizabeth C. Galle; Daniel G. Gibbs; John D. Grier; Roger Hain; Diane M. Harnak Hall; Peter N. Harbo; Xiangqun (Helen) He; John Charles Houck; Margarita Karovska; Vinay L. Kashyap; Jennifer Lauer; Michael L. McCollough; Jonathan C. McDowell; Joseph B. Miller; Arik W. Mitschang; Douglas L. Morgan; Amy E. Mossman; Joy S. Nichols; Michael A. Nowak; David Alexander Plummer
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American Astronomical Society | 2011
David P. Huenemoerder; Arik W. Mitschang; Daniel Dewey; Michael A. Nowak; Norbert S. Schulz; Joy S. Nichols; John E. Davis; John Charles Houck; Michael S. Noble; Douglas L. Morgan; Claude R. Canizares; Herman L. Marshall
, and a time span from 1 to 20 years. A systemic velocity was obtained by removing the pulsation component using a high order Fourier series. From this data we have developed a list of stars showing no orbital velocity larger than
Archive | 2011
David P. Huenemoerder; Arik W. Mitschang; Daniel Dewey; Michael A. Nowak; Norbert S. Schulz; Joy S. Nichols; John E. Davis; John Charles Houck; Herman L. Marshall; Michael S. Noble; Douglas L. Morgan; Claude R. Canizares
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Archive | 2010
Joy S. Nichols; Arne A. Henden; David P. Huenemoerder; Jennifer Lauer; Eric R. Martin; Douglas L. Morgan; Beth Alice Sundheim
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American Astronomical Society | 2010
Joy S. Nichols; Arne A. Henden; David P. Huenemoerder; Jennifer Lauer; Eric R. Martin; Douglas L. Morgan; Beth Alice Sundheim
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Archive | 2009
Francis A. Primini; Michael A. Nowak; John Charles Houck; John E. Davis; Kenny J. Glotfelty; Margarita Karovska; Craig S. Anderson; Nina R. Bonaventura; Jin Chen; Stephen M. Doe; Ian N. Evans; Janet Deponte Evans; G. Fabbiano; Elizabeth C. Galle; Danny G. Gibbs; John D. Grier; Roger Hain; Diane M. Harnak Hall; Peter N. Harbo; Xuehao He; Jennifer Lauer; Michael L. McCollough; Jonathan C. McDowell; Joseph B. Miller; Arik W. Mitschang; Douglas L. Morgan; Joy S. Nichols; David Alexander Plummer; Brian L. Refsdal; Arnold H. Rots
. The binary fraction was analyzed as a function of magnitude, and yields an apparent decrease in this fraction for fainter stars. We interpret this as incompleteness at fainter magnitudes, and derive the preferred binary fraction of
Archive | 2009
Jonathan C. McDowell; Ian N. Evans; Francis A. Primini; Kenny J. Glotfelty; Michael L. McCollough; John Charles Houck; Michael A. Nowak; Margarita Karovska; John E. Davis; Arnold H. Rots; Aneta Siemiginowska; Roger Hain; Janet Deponte Evans; Craig S. Anderson; Nina R. Bonaventura; Jin Chen; Stephen M. Doe; G. Fabbiano; Elizabeth C. Galle; Danny G. Gibbs; John D. Grier; Diane M. Harnak Hall; Peter N. Harbo; Xuehao He; Jennifer Lauer; Joseph B. Miller; Arik W. Mitschang; Douglas L. Morgan; Joy S. Nichols; David Alexander Plummer
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