Variable Stars in the Globular Cluster NGC 6752 (2009)
Kaluzny, Janusz, Thompson, Ian B.
We report time-series photometry for 16 variable stars located in the central part of the globular cluster NGC 6752. The sample includes 13 newly identified objects. The precision of our differential...
The Carnegie Astrometric Planet Search Program (2009)
Boss, Alan P., Weinberger, Alycia J., Anglada-Escude, Guillem, Thompson, Ian B., Burley, Gregory, Birk, Christoph, ...
We are undertaking an astrometric search for gas giant planets and brown dwarfs orbiting nearby low mass dwarf stars with the 2.5-m du Pont telescope at the Las Campanas Observatory in Chile. We have...
Spectroscopic Confirmation of the Pisces Overdensity (2009)
Kollmeier, Juna A., Gould, Andrew, Shectman, Stephen, Thompson, Ian B., Preston, George W., Simon, Joshua D., ...
We present spectroscopic confirmation of the "Pisces Overdensity", also known as "Structure J", a photometric overdensity of RR Lyrae stars discovered by the Sloan Digital Sky Survey (SDSS) at an...
Cohen, Judith G., Thompson, Ian B., Sumi, Takahiro, Bond, Ian, Gould, Andrew, Johnson, Jennifer A., ...
We present abundance analyses based on high dispersion and high signal-to-noise ratio Magellan spectra of two highly microlensed Galactic bulge stars in the region of the main-sequence turnoff with...
Cohen, Judith G., Thompson, Ian B., Sumi, Takahiro, Bond, Ian, Gould, Andrew, Johnson, Jennifer A., ...
We present abundance analyses based on high dispersion and high signal-to-noise ratio Magellan spectra of two highly microlensed Galactic bulge stars in the region of the main sequence turnoff with...
Marshall, J. L., Burles, Scott, Thompson, Ian B., Shectman, Stephen A., Bigelow, Bruce C., Burley, Gregory, ...
The Magellan Echellette (MagE) spectrograph is a single-object optical echellette spectrograph for the Magellan Clay telescope. MagE has been designed to have high throughput in the blue; the peak...
CS22964-161: A Double-Lined Carbon- and s-Process-Enhanced Metal-Poor Binary Star (2007)
Thompson, Ian B., Ivans, Inese I., Bisterzo, Sara, Sneden, Christopher, Gallino, Roberto, Vauclair, Sylvie, ...
A detailed high-resolution spectroscopic analysis is presented for the carbon-rich low metallicity Galactic halo object CS 22964-161. We have discovered that CS 22964-161 is a double-lined...
Chen, Hsiao-Wen, Prochaska, Jason X., Bloom, Joshua S., Thompson, Ian B.
We present an echelle spectrum of the Swift GRB 050730, obtained four hours after the burst using the MIKE spectrograph on the Magellan Clay Telescope when the afterglow was at R=17.7. The spectrum...
Zaritsky, Dennis, Harris, Jason, Thompson, Ian B., Grebel, Eva K.
We present our catalog of U, B, V, and I stellar photometry of the central 64 sq. deg. area of the Large Magellanic Cloud. Internal and external astrometric and photometric tests using existing...
Time Series Photometry of Variable Stars in the Globular Cluster NGC 6397 (2002)
Kaluzny, Janusz, Thompson, Ian B.
Time series BVI photometry is presented for 16 short-period variables located in the central region of the globular cluster NGC 6397. The sample includes 9 newly detected variables. The light curve...
Zaritsky, Dennis, Harris, Jason, Thompson, Ian B., Grebel, Eva K., Massey, Philip
We present our catalog of U, B, V, and I stellar photometry of the central 18 sq. degree area of the Small Magellanic Cloud. We combine our data with the 2MASS and DENIS catalogs to provide, when...
Pych, Wojtek, Kaluzny, Janusz, Krzeminski, Wojtek, Schwarzenberg-Czerny, A., Thompson, Ian B.
We present CCD photometry of SX Phe variables in the field of the globular cluster M 55. We have discovered 27 variables, three of which are probable members of the Sagittarius dwarf galaxy. All of...
The Morphologies of the Small Magellanic Cloud (2000)
Zaritsky, Dennis, Harris, Jason, Grebel, Eva K., Thompson, Ian B.
We compare the distribution of stars of different spectral types, and hence mean age, within the central SMC and find that the asymmetric structures are almost exclusively composed of young main...
CCD Photometry of Faint Variable Stars in the Globular Cluster NGC 6752 (1999)
Thompson, Ian B., Kaluzny, Janusz, Pych, Wojtek, Krzeminski, Wojtek
We present the results of a photometric survey for variable stars in the field of the nearby globular cluster NGC 6752. The cluster was monitored in 1996 and 1997 for a total of 54 hours with 3...