Search Publications
Four First and Two Recalculated Orbits for Binaries
Cvetković, Z.
In this paper, we analyze new orbital elements, and quantities that can be derived from them, for six binaries. For four of them, WDS 00251+4803 = HDS 56, WDS 01071-0036 = HDS 144 AB, WDS 06426+3955 = HDS 930, and WDS 21014+4037 = HDS 2995, the orbital elements are calculated for the first time. For the other two, WDS 04195+3800 = HDS 552 and WDS …
Testing the Global Star Formation relation: An HCO+ (3-2) Mapping Study of Red MSX Sources in the Bolocam Galactic Plane Survey
Juneau, Stéphanie; Reiter, Megan; Shirley, Yancy L. +1 more
We present an analysis of the relation between the star formation rate (SFR) and mass of dense gas in Galactic clumps and nearby galaxies. Using the bolometric luminosity as a measure of SFR and the molecular line luminosity of HCO+ (3-2) as a measure of dense gas mass, we find that the relation between SFR and M dense is app…
Radio Galaxy 3C 230 Observed with Gemini Laser Adaptive-optics Integral-field Spectroscopy
Steinbring, Eric
The Altair laser-guide-star adaptive optics facility combined with the near-infrared integral-field spectrometer on Gemini North have been employed to study the morphology and kinematics of 3C 230 at z = 1.5, the first such observations of a high-redshift radio galaxy. These suggest a bi-polar outflow spanning 0farcs9 (~16 kpc projected distance f…
Observations and Orbital Analysis of the Giant White Dwarf Binary System HR 5692
Torres, Guillermo; Latham, David W.; Stefanik, Robert P. +3 more
We report spectroscopic observations of the red giant star HR 5692, previously known to be a binary system both from other spectroscopic work and from deviations in the astrometric motion detected by the Hipparcos satellite. Earlier International Ultraviolet Explorer (IUE) observations had shown the presence of a hot white dwarf companion to the g…
Identification of a Complete 160 µm Flux-limited Sample of Infrared Galaxies in the ISO Lockman Hole 1 deg2 Deep Fields: Source Properties and Evidence for Strong Evolution in the FIR Luminosity Function for ULIRGs
Aussel, H.; Le Floc'h, E.; Veilleux, S. +13 more
We have identified a complete, flux-limited (S 160>120 mJy) sample of 160 µm selected sources from Spitzer observations of the 1 deg2 Infrared Space Observatory (ISO) Deep Field region in the Lockman Hole (LH). Ground-based UV, optical, and near-infrared (NIR) photometry and optical spectroscopy have been used to det…
New Precision Orbits of Bright Double-lined Spectroscopic Binaries. VII. 47 Andromedae, 38 Cassiopeiae, and HR 8467
Williamson, Michael H.; Fekel, Francis C.; Pourbaix, Dimitri +1 more
Improved orbital elements for three double-lined spectroscopic binaries, 47 And, 38 Cas, and HR 8467, have been determined with extensive new radial velocities. For 38 Cas lines of the secondary have been detected for the first time. Given the orbital periods for these systems of 35.3682, 134.130, and 42.3813 days, respectively, it is not surprisi…
The Dynamical Distance, RR Lyrae Absolute Magnitude, and Age of the Globular Cluster NGC 6266
McNamara, Bernard J.; McKeever, Jean
The internal proper motion dispersion of NGC 6266 was measured using Hubble Space Telescope Wide Field Planetary Camera 2 images with an epoch difference of eight years. The dispersion was found to be 0.041 ± 0.001 arcsec century -1. This value was then equated to the cluster's radial velocity dispersion of 13.7 ± 1.1 km s-1 …
CSO Bolocam 1.1 mm Continuum Mapping of the Braid Nebula Star Formation Region in Cygnus OB7
Pyo, Tae-Soo; Smith, Michael D.; Aspin, Colin +9 more
We present a 1.1 mm map of the Braid Nebula star formation region in Cygnus OB7 taken using Bolocam on the Caltech Submillimeter Observatory. Within the 1 deg2 covered by the map, we have detected 55 cold dust clumps all of which are new detections. A number of these clumps are coincident with IRAS point sources although the majority ar…
A Search for Satellites around Ceres
Russell, C. T.; Stern, S. A.; Young, E. F. +5 more
We conducted a satellite search around the dwarf planet 1 Ceres using Hubble Space Telescope and ground-based Palomar data. No candidate objects were found orbiting Ceres in its entire stability region down to ~500 km from the surface of Ceres. Assuming a satellite would have the same albedo as Ceres, which has a visual geometric albedo of 0.07-0.…
Nongravitational Forces on Comets: An Extension of the Standard Model
Mysen, E.; Aksnes, K.
The accuracy of comet orbit computations is limited by uncertain knowledge of the recoil force due to outgassing from the nuclei. The standard model assumes an exponential dependence of the force on distance from the Sun. This variable force times constants A 1, A 2, and A 3 represents the radial, transverse, and n…