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Gamma-Ray Bursts in the SALT/Swift Era: GRB/SN Connection
K. Z. Stanek
I discuss the Gamma Ray Burst research in the era of SALT and Swift, concentrating on the GRB/SN connection.
BVI Photometric Variability Survey of M3
J. D. Hartman, J. Kaluzny, A. Szentgyorgyi +1
We have conducted a three band (BVI) variability survey of the globular cluster M3. This is the first three band survey of the cluster using modern image subtraction techniques. Ob…
HAT Variability Survey in the High Stellar Density "Kepler Field" with Millimagnitude Image Subtraction Photometry
J. D. Hartman, G. Bakos, K. Z. Stanek +1
The Hungarian-made Automated Telescope network (HATnet) is an ongoing project to detect transiting extra-solar planets using small aperture (11 cm diameter), robotic telescopes. In…
WR 20a is an Eclipsing Binary: Accurate Determination of Parameters for an Extremely Massive Wolf-Rayet System
A. Z. Bonanos, K. Z. Stanek, A. Udalski +7
We present a high-precision I-band light curve for the Wolf-Rayet binary WR 20a, obtained as a sub-project of the Optical Gravitational Lensing Experiment. Rauw et al. have recentl…
The Most Massive Stars in the Local Group: Measuring Accurate Masses of Stars in Eclipsing Binaries
Alceste Z. Bonanos, Krzysztof Z. Stanek
Accurate masses and, in general, all fundamental parameters of distant stars can only be measured in eclipsing binaries. Several massive star candidates with masses near 200 Mo exi…
GRB 021211 as a Faint Analogue of GRB 990123: Exploring the Similarities and Differences in their Optical Afterglows
Stephen T. Holland, David Bersier, J. S. Bloom +7
We present B, V, Rc, J, H, and Ks photometry of the optical afterglow of the gamma-ray burst GRB 021211 taken at the Magellan, MMT, and WIYN observatories between 0.7 and 50 days a…
Using Local Group Galaxies to Investigate the Influence of Blending on Cepheid Distances and the Cosmological Distance Scale
B. J. Mochejska, L. M. Macri, D. D. Sasselov +1
We investigate the influence of blending on the Cepheid distance scale using two Local Group galaxies, M31 and M33. Blending leads to systematically low distances to galaxies obser…
KH 15D: Gradual Occultation of a Pre-Main-Sequence Binary
Joshua N. Winn, Matthew J. Holman, John A. Johnson +2
We propose that the extraordinary ``winking star'' KH 15D is an eccentric pre-main-sequence binary that is gradually being occulted by an opaque screen. This model accounts for the…