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43 papers · 1 filter
Discovery of a Low-Mass Companion to the Solar-Type Star TYC 2534-698-1
Stephen R. Kane, Suvrath Mahadevan, William D. Cochran +4
Brown dwarfs and low-mass stellar companions are interesting objects to study since they occupy the mass region between deuterium and hydrogen burning. We report here the serendipi…
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…
The Transit Light Curve Project. X. A Christmas Transit of HD 17156b
Joshua N. Winn, Matthew J. Holman, Gregory W. Henry +6
Photometry is presented of the Dec. 25, 2007 transit of HD 17156b, which has the longest orbital period and highest orbital eccentricity of all the known transiting exoplanets. New…
Welcome back, Polaris the Cepheid
H. Bruntt, A. J. Penny, D. Stello +2
For about 100 years the amplitude of the 4-day pulsation in Polaris has decreased. We present new results showing a significant increase in the amplitude based on 4.5 years of cont…
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…
Polaris the Cepheid returns: 4.5 years of monitoring from ground and space
H. Bruntt, N. R. Evans, D. Stello +6
We present the analysis of 4.5 years of nearly continuous observations of the classical Cepheid Polaris, which comprise the most precise data available for this star. We have made…