3.3k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Herzberg Institute of AstrophysicsCA335 papers
- National Research Council CanadaCA238 papers
- University of TorontoCA90 papers
- California Institute of TechnologyUS78 papers
- 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
- Instituto de Astrofísica de CanariasES50 papers
- Space Telescope Science InstituteUS50 papers
- Carnegie ObservatoriesUS49 papers
342 papers · 1 filter
MOST photometry of the enigmatic PMS pulsator HD 142666
K. Zwintz, T. Kallinger, D. B. Guenther +11
We present precise photometry of the pulsating Herbig Ae star HD 142666 obtained in two consecutive years with the MOST (Microvariability & Oscilations of STars) satellite. Previou…
An Improved Method for Using MgII to Estimate Black Hole Masses in Active Galactic Nuclei
Christopher A. Onken, Juna A. Kollmeier
We present a method for obtaining accurate black hole (BH) mass estimates from the MgII emission line in active galactic nuclei (AGNs). Employing the large database of AGN measurem…
The Magnitude-Diameter Relation of Galaxies
Sidney van den Bergh
We investigate the dependence of the luminosity-diameter relation of galaxies on the environment. This study is based on a comparison between the 80 galaxies in the Shapley-Ames Ca…
Assessing potential cluster Cepheids from a new distance and reddening parameterization and 2MASS photometry
Daniel J. Majaess, David G. Turner, David J. Lane
A framework is outlined to assess Cepheids as potential cluster members from readily available photometric observations. A relationship is derived to estimate colour excess and dis…
A Spectroscopic and Photometric Study of the Metal-Poor, Pulsating, Post-AGB Binary HD 46703
Bruce J. Hrivnak, Hans Van Winckel, Maarten Reyniers +3
The metal-poor post-AGB star HD 46703 is shown to be a single-line spectroscopic binary with a period of 600 days, a high velocity of -94 km/s, and an orbital eccentricity of 0.3.…
Luminosity-Diameter Relations for Globular Clusters and Dwarf Spheroidal Galaxies
Sidney van den Bergh
It is shown that globular clusters and the dwarf spheroidal companions of the Galaxy have a different distribution of flattening values, and appear to occupy adjacent regions of th…
MOST detects SPBe pulsations in HD 127756 & HD 217543: Asteroseismic rotation rates independent of vsini
C. Cameron, H. Saio, R. Kuschnig +7
The MOST (Microvariability and Oscillations of Stars) satellite has discovered SPBe (Slowly Pulsating Be) oscillations in the stars HD 127756 (B1/B2 Vne) and HD 217543 (B3 Vpe). Fo…
A model of diffuse Galactic Radio Emission from 10 MHz to 100 GHz
Angelica de Oliveira-Costa, Max Tegmark, B. M. Gaensler +3
Understanding diffuse Galactic radio emission is interesting both in its own right and for minimizing foreground contamination of cosmological measurements. Cosmic Microwave Backgr…
A large-scale survey for variable stars in M33
D. Bersier, J. D. Hartman, K. Z. Stanek +6
We have started a survey of M 33 in order to find variable stars and Cepheids in particular. We have obtained more than 30 epochs of g'r'i' data with the CFHT and the one-square-de…
The ACS LCID Project: RR Lyrae stars as tracers of old population gradients in the isolated dwarf spheroidal galaxy Tucana
Edouard J. Bernard, Carme Gallart, Matteo Monelli +9
We present a study of the radial distribution of RR Lyrae variables, which present a range of photometric and pulsational properties, in the dwarf spheroidal galaxy Tucana. We find…
A Deep HST Study of the Globular Cluster NGC 6397: Reduction Methods
Jay Anderson, Ivan R. King, Harvey B. Richer +6
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 i…
The Globular Cluster M15. I. Identification, Discovery, and Period Determination of Variable Stars
T. M. Corwin, J. Borissova, P. B. Stetson +4
We present new CCD photometry for variables in the globular cluster M15. Our photometry was obtained using both the image subtraction package ISIS and DAOPHOT/ALLFRAME. The d…
Stellar Wind Variations During the X-ray High and Low States of Cygnus X-1
D. R. Gies, C. T. Bolton, R. M. Blake +10
We present results from Hubble Space Telescope UV spectroscopy of the massive X-ray binary system, HD226868 = Cyg X-1. The spectra were obtained at both orbital conjunction phases…
The HST/ACS Coma Cluster Survey: I - Survey Objectives and Design
David Carter, Paul Goudfrooij, Bahram Mobasher +34
We describe the HST ACS Coma cluster Treasury survey, a deep two-passband imaging survey of one of the nearest rich clusters of galaxies, the Coma cluster (Abell 1656). The survey…
On the white dwarf cooling sequence of the globular cluster Omega Centauri
A. Calamida, C. E. Corsi, G. Bono +16
We present deep and precise photometry (F435, F625W, F658N) of Omega Cen collected with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST). We have ide…
Nonradial p-modes in the G9.5 giant epsilon Oph? Pulsation model fits to MOST photometry
T. Kallinger, D. B. Guenther, J. M. Matthews +6
The G9.5 giant eps Oph shows evidence of radial p-mode pulsations in both radial velocity and luminosity. We re-examine the observed frequencies in the photometry and radial veloci…
Looking for Super-Earths in the HD 189733 System: A Search for Transits in Most Space-Based Photometry
Bryce Croll, Jaymie M. Matthews, Jason F. Rowe +10
We have made a comprehensive transit search for exoplanets down to ~1.5 - 2 Earth radii in the HD 189733 system, based on 21-days of nearly uninterrupted broadband optical photomet…
The short period end of the contact binary period distribution based on the All Sky Automated Survey (ASAS)
Slavek M. Rucinski
The search-volume corrected period distribution of contact binaries of the W UMa type appears to reflect primarily the constant number ratio of ~1/500 to the number of stars along…
Stroemgren photometry of Galactic Globular Clusters. I. New Calibrations of the metallicity index
A. Calamida, G. Bono, P. B. Stetson +15
We present a new calibration of the Stroemgren metallicity index m1 using red giant (RG) stars in 4 globular clusters (GCs:M92,M13,NGC1851,47Tuc) with metallicity ranging from [Fe/…
The James Clerk Maxwell Telescope Legacy Survey of Nearby Star-forming Regions in the Gould Belt
D. Ward-Thompson, J. Di Francesco, J. Hatchell +59
This paper describes a James Clerk Maxwell Telescope (JCMT) legacy survey that has been awarded roughly 500 hrs of observing time to be carried out from 2007 to 2009. In this surve…
Some Musings on Galaxy Morphology
Sidney van den Bergh
Careful inspection of large-scale photographs of Shapley-Ames galaxies seems to show a smooth transition between the morphological characteristics of galaxies located on the narrow…
HST Photometry for the Halo Stars in the Leo Elliptical NGC 3377
W. E. Harris, G. L. H. Harris, A. C. Layden +1
We have used the ACS camera on HST to obtain (V,I) photometry for 57,000 red-giant stars in the halo of the Leo elliptical NGC 3377. We use this sample of stars to derive the metal…
The Clusters AgeS Experiment (CASE). I. V209 omega Cen - An Eclipsing Post-Common Envelope Binary in the Globular Cluster omega Cen
J. Kaluzny, S. M. Rucinski, I. B. Thompson +2
We use photometric and spectroscopic observations of the detached eclipsing binary V209 omega Cen to derive the masses, radii, and luminosities of the component stars. The system e…
Photometry of the Globular Cluster NGC 5466: Red Giants and Blue Stragglers
Nassissie Fekadu, Eric L. Sandquist, Michael Bolte
We present wide-field BVI photometry for about 11,500 stars in the low-metallicity cluster NGC 5466. We have detected the red giant branch bump for the first time, although it is a…