Search Publications
A Detailed Spatiokinematic Model of the Conical Outflow of the Multipolar Planetary Nebula NGC 7026
López, J. A.; Steffen, W.; Richer, M. G. +1 more
We present extensive, long-slit, high-resolution coverage of the complex planetary nebula (PN) NGC 7026. We acquired 10 spectra using the Manchester Echelle Spectrometer at San Pedro Martir Observatory in Baja California, Mexico, and each shows exquisite detail, revealing the intricate structure of this object. Incorporating these spectra into the…
HH 222: A Giant Herbig-Haro Flow from the Quadruple System V380 Ori
Kraus, Stefan; Bally, John; Geballe, T. R. +5 more
HH 222 is a giant shocked region in the L1641 cloud, and is popularly known as the Orion Streamers or "the waterfall" on account of its unusual structure. At the center of these streamers are two infrared sources coincident with a nonthermal radio jet aligned along the principal streamer. The unique morphology of HH 222 has long been associated wi…
Late-time Dust Emission from the Type IIn Supernova 1995N
Van Dyk, Schuyler D.
Type IIn supernovae (SNe IIn) have been found to be associated with significant amounts of dust. These core-collapse events are generally expected to be the final stage in the evolution of highly massive stars, either while in an extreme red supergiant phase or during a luminous blue variable phase. Both evolutionary scenarios involve substantial …
Very Low Mass Stellar and Substellar Companions to Solar-like Stars from MARVELS. IV. A Candidate Brown Dwarf or Low-mass Stellar Companion to HIP 67526
Bizyaev, Dmitry; Brewington, Howard; Ebelke, Garrett +50 more
We report the discovery of a candidate brown dwarf (BD) or a very low mass stellar companion (MARVELS-5b) to the star HIP 67526 from the Multi-object Apache point observatory Radial Velocity Exoplanet Large-area Survey (MARVELS). The radial velocity curve for this object contains 31 epochs spread over 2.5 yr. Our Keplerian fit, using a Markov Chai…
Kinematics of the Orion Trapezium Based on Diffracto-Astrometry and Historical Data
Olivares, J.; Sánchez, L. J.; Ruelas-Mayorga, A. +3 more
Using the novel Diffracto-Astrometry technique, we analyze 44 Hubble Space Telescope Wide Field Planetary Camera 2 images of the Orion Trapezium (OT) taken over a span of 12 yr (1995-2007). We measure the relative positions of the six brighter OT components (A-F) and supplement these results with measurements of the relative separations and positi…
Analysis of Detached Eclipsing Binaries near the Turnoff of the Open Cluster NGC 7142
Orosz, Jerome; Shetrone, Matthew; Sandquist, Eric L. +1 more
We analyze extensive BVRCIC photometry and radial velocity measurements for three double-lined deeply eclipsing binary stars in the field of the old open cluster NGC 7142. The short period (P = 1.9096825 days) detached binary V375 Cep is a high probability cluster member, and has a total eclipse of the secondary star. The cha…
Companions to nearby Stars with Astrometric Acceleration. II
Tokovinin, Andrei; Hayward, Thomas L.; Hartung, Markus
Hipparcos astrometric binaries were observed with the NICI adaptive optics system at Gemini-S, completing the work of Paper I. Among the 65 F, G, and K dwarfs within 67 pc of the Sun studied here, we resolve 18 new subarcsecond companions, remeasure 7 known astrometric pairs, and establish the physical nature of yet another 3 wider companions. The…
Structural Parameters for Globular Clusters in M31
Ma, Jun; Wang, Song
In this paper, we present surface brightness profiles for 79 globular clusters in M31, using images observed with the Hubble Space Telescope, some of which are from new observations. The structural and dynamical parameters are derived from fitting the profiles to several different models for the first time. The results show that in the majority of…
On the Density Profile of the Globular Cluster M92
Walker, A. R.; Stetson, P. B.; Bono, G. +10 more
We present new number density and surface brightness profiles for the globular cluster M92 (NGC 6341). These profiles are calculated from optical images collected with the CCD mosaic camera MegaCam at the Canada-France-Hawaii Telescope and with the Advanced Camera for Surveys on the Hubble Space Telescope. The ground-based data were supplemented w…
Astrometry and Orbits of Nix, Kerberos, and Hydra
Buie, Marc W.; Grundy, William M.; Tholen, David J.
We present new Hubble Space Telescope observations of three of Pluto's outer moons, Nix, Kerberos, and Hydra. This work revises previously published astrometry of Nix and Hydra from 2002 to 2003. New data from a four-month span during 2007 include observations designed to better measure the positions of Nix and Hydra. A third data set from 2010 al…