Zobrazeno 1 - 10
of 107
pro vyhledávání: '"King, Ivan R."'
Autor:
Kalirai, Jason S., Richer, Harvey B., Anderson, Jay, Dotter, Aaron, Fahlman, Gregory G., Hansen, Brad M. S., Hurley, Jarrod, King, Ivan R., Reitzel, David, Rich, R. Michael, Shara, Michael M., Stetson, Peter B., Woodley, Kristin A.
Publikováno v:
2012, AJ, 143, 11
In HST Cycle 17, we imaged the well known globular star cluster 47 Tucanae for 121 orbits using ACS and both the UVIS and IR channels of WFC3 (GO-11677, PI - H. Richer). This unique data set was obtained to address many scientific questions that dema
Externí odkaz:
http://arxiv.org/abs/1112.1426
Autor:
Anderson, Jay, Sarajedini, Ata, Bedin, Luigi R., King, Ivan R., Piotto, Giampaolo, Reid, I. Neill, Siegel, Michael, Majewski, Steven R., Paust, Nathaniel E. Q., Aparicio, Antonio, Milone, Antonino P., Chaboyer, Brian, Rosenberg, Alfred
The ACS Survey of Globular Clusters has used HST's Wide-Field Channel to obtain uniform imaging of 65 of the nearest globular clusters to provide an extensive homogeneous dataset for a broad range of scientific investigations. The survey goals requir
Externí odkaz:
http://arxiv.org/abs/0804.2025
Autor:
Anderson, Jay, King, Ivan R., Richer, Harvey B., Fahlman, Gregory G., Hansen, Brad M. S., Hurley, Jarrod, Kalirai, Jasonjot S., Rich, R. Michael, Stetson, Peter B.
We describe here the reduction methods that we developed to study the faintest red dwarfs and white dwarfs in an outer field of NGC6397, which was observed by \hst for 126 orbits in 2005. The particular challenge of this data set is that the faintest
Externí odkaz:
http://arxiv.org/abs/0803.0740
Autor:
Hurley, Jarrod R., Shara, Michael M., Richer, Harvey B., King, Ivan R., Davis, D. Saul, Kalirai, Jason S., Hansen, Brad M. S., Dotter, Aaron, Anderson, Jay, Fahlman, Gregory G., Rich, R. Michael
We present N-body models to complement deep imaging of the metal-poor core-collapsed cluster NGC6397 obtained with the Hubble Space Telescope. All simulations include stellar and binary evolution in-step with the stellar dynamics and account for the
Externí odkaz:
http://arxiv.org/abs/0802.4127
Autor:
Richer, Harvey B., Anderson, Jay, Brewer, James, Davis, Saul, Fahlman, Gregory G., Hansen, Brad M. S., Hurley, Jarrod, Kalirai, Jasonjot S., King, Ivan R., Reitzel, David, Rich, R. Michael, Shara, Michael M., Stetson, Peter B.
Publikováno v:
Science313:936,2006
NGC 6397 is the second closest globular star cluster to the Sun. Using 5 days of time on the Hubble Space Telescope, we have constructed the deepest ever color-magnitude diagram for this cluster. We see a clear truncation in each of its two major ste
Externí odkaz:
http://arxiv.org/abs/astro-ph/0702209
Autor:
Kalirai, Jasonjot S., Anderson, Jay, Richer, Harvey B., King, Ivan R., Brewer, James P., Carraro, Giovanni, Davis, Saul D., Fahlman, Gregory G., Hansen, Brad M. S., Hurley, Jarrod R., Lepine, Sebastien, Reitzel, David B., Rich, R. Michael, Shara, Michael M., Stetson, Peter B.
Publikováno v:
Astrophys.J.Lett.657:L93-L96,2007
As a by-product of high-precision, ultra-deep stellar photometry in the Galactic globular cluster NGC 6397 with the Hubble Space Telescope, we are able to measure a large population of background galaxies whose images are nearly point-like. These pro
Externí odkaz:
http://arxiv.org/abs/astro-ph/0701781
Autor:
Piotto, Giampaolo, Villanova, Sandro, Bedin, Luigi R., Gratton, Raffaele, Cassisi, Santi, Momany, Yazan, Recio-Blanco, Alejandra, Lucatello, Sara, Anderson, Jay, King, Ivan R., Pietrinferni, Adriano, Carraro, Giovanni
Publikováno v:
Astrophys.J.621:777-784,2005
Having shown in a recent paper that the main sequence of omega Centauri is split into two distinct branches, we now present spectroscopic results showing that the bluer sequence is_less_ metal-poor. We have carefully combined GIRAFFE@VLT spectra of 1
Externí odkaz:
http://arxiv.org/abs/astro-ph/0412016
Autor:
Piotto, Giampaolo, De Angeli, Francesca, King, Ivan R., Djorgovski, S. G., Bono, Giuseppe, Cassisi, Santi, Meylan, Georges, Recio-Blanco, Alejandra, Rich, R. M., Davies, Melvyn B.
Publikováno v:
Astrophys.J. 604 (2004) L109-L112
We discuss the main properties of the Galactic globular cluster (GC) blue straggler stars (BSS), as inferred from our new catalog containing nearly 3000 BSS. The catalog has been extracted from the photometrically homogeneous V vs. (B-V) color-magnit
Externí odkaz:
http://arxiv.org/abs/astro-ph/0402592
We have carried out further analysis of the tentative, short-term brightenings reported by Sahu et al. (2001), which were suggested to be possible lensings of Galactic-bulge stars by free-floating planets in the globular cluster M22. Closer examinati
Externí odkaz:
http://arxiv.org/abs/astro-ph/0112264
A proper-motion separation of M4 members from field stars, using deep HST observations separated by a time base-line of 5 years, allows us to study a pure sample of cluster main-sequence stars almost to the minimum mass for hydrogen burning. High-pre
Externí odkaz:
http://arxiv.org/abs/astro-ph/0109059