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16 papers · 2 filters
A long-period planet orbiting a nearby Sun-like star
Hugh R. A. Jones, R. Paul Butler, C. G. Tinney +10
The Doppler wobble induced by the extra-solar planet HD 134987b was first detected by data from the Keck Telescope nearly a decade ago, and was subsequently confirmed by data from…
RR Lyrae variables in M32 and the disk of M31
Giuliana Fiorentino, Antonela Monachesi, Scott C. Trager +7
We observed two fields near M32 with the Advanced Camera for Surveys/High Resolution Channel (ACS/HRC) on board the Hubble Space Telescope (HST). The main field, F1, is 1.8 arcmin…
The Clusters AgeS Experiment (CASE). IV. Analysis of the Eclipsing Binary V69 in the Globular Cluster 47 Tuc
I. B. Thompson, J. Kaluzny, S. M. Rucinski +4
We use photometric and spectroscopic observations of the eclipsing binary V69-47 Tuc to derive the masses, radii, and luminosities of the component stars. Based on measured systemi…
Variable Stars in the Globular Cluster NGC 6752
Janusz Kaluzny, Ian B. Thompson
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…
On the Progenitor of the Type II-Plateau SN 2008cn in NGC 4603
N. Elias-Rosa, S. D. Van Dyk, W. Li +7
Through comparison of pre- and post-explosion images obtained with the Wide Field and Planetary Camera 2 onboard the Hubble Space Telescope, we have isolated a supergiant star prio…
Chemical Composition of Faint (I~21 mag) Microlensed Bulge Dwarf OGLE-2007-BLG-514S
Courtney R. Epstein, Jennifer A. Johnson, Subo Dong +3
We present a high-resolution spectrum of a microlensed G dwarf in the Galactic bulge with spectroscopic temperature T_eff = 5600 +/- 180 K. This I~21 mag star was magnified by a fa…