Search Publications
Studies of NGC 6720 with Calibrated HST/WFC3 Emission-line Filter Images. II. Physical Conditions
O'Dell, C. R.; Henney, W. J.; Ferland, G. J. +1 more
We have performed a detailed analysis of the electron temperature and density in the Ring Nebula using the calibrated Hubble Space Telescope WFC3 images described in the preceding paper. The electron temperature (T e) determined from [N II] and [O III] rises slightly and monotonically toward the central star. The observed equivalent wid…
Studies of NGC 6720 with Calibrated HST/WFC3 Emission-line Filter Images. III. Tangential Motions using AstroDrizzle Images
O'Dell, C. R.; Henney, W. J.; Ferland, G. J. +1 more
We have been able to compare with astrometric precision AstroDrizzle processed images of NGC 6720 (the Ring Nebula) made using two cameras on the Hubble Space Telescope. The time difference of the observations was 12.925 yr. This large time base allowed the determination of tangential velocities of features within this classic planetary nebula. In…
Hubble Space Telescope and Optical Data on SDSSJ0804+5103 (EZ Lyn) One Year after Outburst
Szkody, Paula; Sion, Edward M.; Gänsicke, Boris T. +3 more
We present an ultraviolet (UV) spectrum and light curve of the short orbital period cataclysmic variable EZ Lyn obtained with the Cosmic Origins Spectrograph on the Hubble Space Telescope 14 months after its dwarf nova outburst, along with ground-based optical photometry. The UV spectrum can be fit with a 13,100 K, log g = 8 white dwarf using 0.5 …
The Relationship between the Dense Neutral and Diffuse Ionized Gas in the Thick Disks of Two Edge-on Spiral Galaxies
Hirschauer, Alec S.; Savage, Blair D.; Fox, Andrew J. +3 more
We present high-resolution, optical images (BVI + Hα) of the multiphase interstellar medium (ISM) in the thick disks of the edge-on spiral galaxies NGC 4013 and NGC 4302. Our images from the Hubble Space Telescope (HST), Large Binocular Telescope, and WIYN 3.5 m telescope reveal an extensive population of filamentary dust absorption seen to z ~2-2…
Phase-resolved Infrared Spectroscopy and Photometry of V1500 Cygni, and a Search for Similar Old Classical Novae
Harrison, Thomas E.; Lyke, James E.; Campbell, Randy D.
We present phase-resolved near-infrared photometry and spectroscopy of the classical nova (CN) V1500 Cyg to explore whether cyclotron emission is present in this system. While the spectroscopy do not indicate the presence of discrete cyclotron harmonic emission, the light curves suggest that a sizable fraction of its near-infrared fluxes are due t…
XMM-Newton Observation of the α Persei Cluster
Wolk, Scott J.; Pillitteri, Ignazio; Remage Evans, Nancy +1 more
We report on the analysis of an archival observation of part of the α Persei cluster obtained with XMM-Newton. We detected 102 X-ray sources in the band 0.3-8.0 keV, of which 39 of them are associated with the cluster as evidenced by appropriate magnitudes and colors from Two Micron All Sky Survey photometry. We extend the X-ray luminosity distrib…
M31 Globular Cluster Structures and the Presence of X-Ray Binaries
Barmby, P.; Agar, J. R. R.
The Andromeda galaxy, M31, has several times the number of globular clusters found in the Milky Way. It contains a correspondingly larger number of low-mass X-ray binaries (LMXBs) associated with globular clusters, and as such can be used to investigate the cluster properties that lead to X-ray binary formation. The best tracer of the spatial stru…
Local Variability in the Orbit of Saturn's F Ring
Cooper, N. J.; Murray, C. D.; Williams, G. A.
We present an analysis of the orbit of Saturn's F ring using images recorded by the Imaging Science Subsystem of the Cassini spacecraft. A total of 9805 observations have been made from 10 image sequences obtained between 2006 November 23 and 2009 July 28. Each sequence of up to 240 images spans a single orbit of the F ring, allowing 10 independen…
Statistical Study of 2XMMi-DR3/SDSS-DR8 Cross-correlation Sample
Zhao, Yong-Heng; Wu, Xue-Bing; Zhou, Xin-Lin +1 more
Cross-correlating the XMM-Newton 2XMMi-DR3 catalog with the Sloan Digital Sky Survey (SDSS) Data Release 8, we obtain one of the largest X-ray/optical catalogs and explore the distribution of various classes of X-ray emitters in the multidimensional photometric parameter space. Quasars and galaxies occupy different zones while stars scatter in the…
Binary Star Synthetic Photometry and Distance Determination Using BINSYN
Linnell, Albert P.; Hubeny, Ivan; DeStefano, Paul
This paper extends synthetic photometry to components of binary star systems. The paper demonstrates accurate recovery of single star photometric properties for four photometric standards, Vega, Sirius, GD153, and HD209458, ranging over the HR diagram, when their model synthetic spectra are placed in fictitious binary systems and subjected to synt…