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Determining Accurate Distances to Nearby Galaxies
Alceste Bonanos
We have undertaken several projects with the purpose of determining accurate distances to nearby galaxies to calibrate the extragalactic distance scale. Specifically, I describe th…
The RR Lyrae Distance to the Draco Dwarf Spheroidal Galaxy
A. Z. Bonanos, K. Z. Stanek, A. H. Szentgyorgyi +2
We present the first CCD variability study of the Draco dwarf spheroidal galaxy. The data were obtained with the FLWO 1.2 m telescope on 22 nights, over a period of 10 months, cove…
Photometry and Spectroscopy of GRB 030329 and Its Associated Supernova 2003dh: The First Two Months
T. Matheson, P. M. Garnavich, K. Z. Stanek +4
We present extensive optical and infrared photometry of the afterglow of gamma-ray burst (GRB) 030329 and its associated supernova (SN) 2003dh over the first two months after detec…
Re-analysis of VLT Data for M83 with Image Subtraction -- Nine-fold Increase in Number of Cepheids
A. Z. Bonanos, K. Z. Stanek
We apply the image subtraction method to re-analyze the ESO Very Large Telescope data on M83 (NGC 5236), obtained and analyzed by Thim et al. Whereas Thim et al. found 12 Cepheids…
DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids. IX. Variables in the Field M31Y Discovered with Image Subtraction
A. Z. Bonanos, K. Z. Stanek, D. D. Sasselov +3
The DIRECT Project aims to obtain direct distances to two Local Group galaxies, M31 and M33, which occupy a crucial position near the bottom of the cosmological distance ladder. Th…