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- Herzberg Institute of AstrophysicsCA335 papers
- National Research Council CanadaCA238 papers
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- Centre National de la Recherche ScientifiqueFR66 papers
- University of VictoriaCA63 papers
- Center for Astrophysics Harvard & SmithsonianUS62 papers
- National Institute for AstrophysicsIT60 papers
- University of California, Santa CruzUS51 papers
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6 papers · 2 filters
Radio emission from the massive stars in the Galactic Super Star Cluster Westerlund 1
S. M. Dougherty, J. S. Clark, I. Negueruela +2
Current mass-loss rate estimates imply that main sequence winds are not sufficient to strip away the H-rich envelope to yield Wolf-Rayet (WR) stars. The rich transitional populatio…
On a new Near-Infrared method to estimate the absolute ages of star clusters: NGC3201 as a first test case
G. Bono, P. B. Stetson, D. A. VandenBerg +24
We present a new method to estimate the absolute ages of stellar systems. This method is based on the difference in magnitude between the main sequence turn-off (MSTO) and a well d…
Stromgren photometry of Galactic Globular Clusters. II Metallicity distribution of red giants in Omega Centauri
A. Calamida, G. Bono, P. B. Stetson +23
We present new intermediate-band Stroemgren photometry based on more than 300 u,v,b,y images of the Galactic globular cluster Omega Cen. Optical data were supplemented with new mul…
The Cepheid Impostor HD 18391 and its Anonymous Parent Cluster
David G. Turner, V. V. Kovtyukh, Daniel J. Majaess +2
New and existing photometry for the G0 Ia supergiant HD 18391 is analyzed in order to confirm the nature of the variablity previously detected in the star, which lies off the hot e…
The Radial Distribution of the Two Stellar Populations in NGC 1851
A. P. Milone, P. B. Stetson, G. Piotto +4
We have analyzed ACS/WFC and WFPC2 images from HST, as well as ground-based data to study the radial distribution of the double sub-giant branch (SGB) recently discovered in the Ga…
Orbitally modulated dust formation by the WC7+O5 colliding-wind binary WR140
P. M. Williams, S. V. Marchenko, A. P. Marston +6
We present high-resolution infrared (2--18 micron) images of the archetypal periodic dust-making Wolf-Rayet binary system WR140 (HD 193793) taken between 2001 and 2005, and multi-c…