Search Publications
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…
The Closest M-dwarf Quadruple System to the Sun
White, R. J.; Quinn, S. N.; Riedel, A. R. +8 more
We report new infrared radial velocity measurements obtained with CSHELL at NASA's Infrared Telescope Facility that reveal the M3.5 dwarf GJ 867B to be a single-lined spectroscopic binary with a period of 1.795 ± 0.017 days. Its velocity semi-amplitude of 21.4 ± 0.5 km s-1 corresponds to a minimum mass of 61 ± 7 M JUP; the ne…
A Detailed Study of the Structure of the Nested Planetary Nebula, Hb 12, the Matryoshka Nebula
Winge, C.; López, J. A.; Edwards, M. L. +1 more
We present near-IR, integral field spectroscopic observations of the planetary nebula (PN) Hb 12 using Near-infrared Integral Field Spectrograph (NIFS) on Gemini-North. Combining NIFS with the adaptive optics system Altair, we provide a detailed study of the core and inner structure of this PN. We focus the analysis in the prominent emission lines…
Orbits for Eight Hipparcos Double Stars
Cvetković, Z.; Pavlović, R.; Ninković, S.
In this paper, we analyze new orbital elements and the quantities that follow from them for eight binaries: WDS 00101+3825 = HDS 23Da,Db, WDS 00321-1218 = HDS 71, WDS 04287+2613 = HDS 576, WDS 04389-1207 = HDS 599, WDS 16206+4535 = HDS 2309, WDS 17155+1052 = HDS 2440, WDS 22161-0705 = HDS 3158, and WDS 23167+3441 = HDS 3315. For seven of them, the…
Herschel Observations of Circinus X-1 during Outburst and Quiescence
Harrison, Thomas E.; Gelino, Dawn M.; Buxton, Michelle +1 more
We have used the Photodetector Array Camera and Spectrometer and Spectral and Photometric Imaging REceiver instruments on the Herschel Space Observatory to observe Cir X-1 both in and out of outburst. We detected Cir X-1 during outburst at 70 µm. Unfortunately, a cold background source dominates Cir X-1 at longer wavelengths. We have assembl…
The Period Analysis of V418 Aql, SU Boo, RV CVn, CR Cas, GV Cyg, V432 Per, and BD+42 2782
Wolf, M.; Kučáková, H.; Uhlař, R. +1 more
The minimum timings of eclipsing binaries V418 Aql, SU Boo, RV CVn, CR Cas, GV Cyg, V432 Per, and BD+42 2782 were collected and analyzed. Their long-term behavior was studied via period analysis, revealing a periodic term in eclipse times. We derived 576 new times of minimum. Hence, to describe the periodic variation, a third-body hypothesis was p…