Search Publications
Bright Debris Disk Candidates Detected with the AKARI/Far-infrared Surveyor
Jiang, Peng; Wang, Tinggui; Liu, Qiong
We cross-correlate the Hipparcos main-sequence star catalog with the AKARI/FIS catalog and identify 136 stars (at >90% reliability) with far-infrared detections in at least one band. After rejecting 57 stars classified as young stellar objects, Be stars and other type stars with known dust disks or with potential contaminations, and 4 stars wit…
HFPK 334: An Unusual Supernova Remnant in the Small Magellanic Cloud
Haberl, F.; Filipović, M. D.; Urošević, D. +5 more
We present new Australia Telescope Compact Array radio-continuum and XMM-Newton/Chandra X-ray Observatory observations of the unusual supernova remnant (SNR) HFPK 334 in the Small Magellanic Cloud (SMC). The remnant follows a shell-type morphology in the radio continuum and has a size of ~20 pc at the SMC distance. The X-ray morphology is similar;…
The Ultraviolet Attenuation Law in Backlit Spiral Galaxies
Holwerda, Benne W.; Schawinski, Kevin; Keel, William C. +2 more
The effective extinction law (attenuation behavior) in galaxies in the emitted ultraviolet (UV) regime is well known only for actively star-forming objects and combines effects of the grain properties, fine structure in the dust distribution, and relative distributions of stars and dust. We use Galaxy Evolution Explorer, XMM Optical Monitor, and H…
Interesting Features in the Combined GALEX and Sloan Color Diagrams of Solar-like Galactic Populations
Smith, Myron A.; Bianchi, Luciana; Shiao, Bernard
We report on intriguing photometric properties of Galactic stars observed in the Galaxy Evolution Explorer (GALEX) satellite's far-UV (FUV) and near-UV (NUV) bandpasses, as well as from the ground-based Sloan Digital Sky Survey (SDSS) and the Kepler Input Catalog. The first property is that the (FUV - NUV) color distribution of stars in the Kepler…
Exploring Overstabilities in Saturn's A Ring Using Two Stellar Occultations
Nicholson, P. D.; Hedman, M. M.; Salo, H.
Certain regions of Saturn's rings exhibit periodic opacity variations with characteristic radial wavelengths of up to a few hundred meters that have been attributed to viscous overstabilities. The Visual and Infrared Mapping Spectrometer on board the Cassini spacecraft observed two stellar occultations of the star γ Crucis that had sufficient reso…
Reinvestigating the Clusters Koposov 1 and 2
van Belle, Gerard; Paust, Nathaniel; Wilson, Danielle
We investigate the fundamental parameters of age, distance, and mass function slope for the poorly studied clusters Koposov 1 and Koposov 2. These clusters were discovered recently and tentatively classified as globular clusters. Using the Large Monolithic Imager on Lowell Observatory's Discovery Channel Telescope, we present photometry extending …
The Optical and Infrared Photometric Evolution of the Recent Stellar Merger, V1309 Sco
Laine, Seppo; Wahlgren, Glenn M.; Barway, Sudhanshu +7 more
Nova Sco 2008 was recently shown to have resulted from the merger of the two stars in the contact binary V1309 Sco. This is the first stellar merger ever observed between two convective stars. We present archival data, new infrared photometry, and Hubble Space Telescope WFC3 imaging of V1309 Sco. Spitzer observations show that it had a large infra…
Diffuse X-Ray Emission from the Superbubbles N70 and N185 in the Large Magellanic Cloud
Velázquez, P. F.; Rosado, M.; Reyes-Iturbide, J. +3 more
We present a study of the diffuse X-ray emission from superbubbles (SBs) N70 (DEM L301) and N185 (DEM L25) located in the Large Magellanic Cloud, based on data from the XMM-Newton Satellite. We obtained spectra and images of these objects in the soft X-ray energy band. These X-ray spectra were fitted by a thermal plasma model, with temperatures of…
A Star-forming Shock Front in Radio Galaxy 4C+41.17 Resolved with Laser-assisted Adaptive Optics Spectroscopy
Steinbring, Eric
Near-infrared integral-field spectroscopy of redshifted [O III], Hβ, and optical continuum emission from the z = 3.8 radio galaxy 4C+41.17 is presented, obtained with the laser-guide-star adaptive optics facility on the Gemini North telescope. Employing a specialized dithering technique, a spatial resolution of 0.''10, or 0.7 kpc, is achieved in e…
Water Production in Comets C/2011 l4 (PanSTARRS) and C/2012 f6 (Lemmon) from observations with SOHO/SWAN
Bertaux, J. -L.; Combi, M. R.; Quémerais, E. +3 more
Comets C/2011 L4 (PanSTARRS) and C/2012 F6 (Lemmon) were observed throughout their 2012-2013 apparitions with the Solar Wind Anisotropies (SWAN) all-sky hydrogen Lyα camera on board the Solar and Heliosphere Observatory (SOHO) satellite. SOHO has been in a halo orbit around the L1 Earth-Sun Lagrange point since early 1996 and has been observing th…