Search Publications
Spatial Extension in the Ultraviolet Spectrum of VV Cephei
Bennett, Philip D.; Gull, Theodore R.; Hagen Bauer, Wendy
Two-dimensional processing of Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS) echelle spectra of the eclipsing M2 Iab + B binary system, VV Cep, has revealed extended emission in all 21 epochs observed, ranging from midtotality through the first quadrature. In the ultraviolet accessible to STIS (1150- 3150 Å), essentially al…
The Ringed Spiral Galaxy NGC4622. II. An Independent Determination that the Two Outer Arms Lead
Byrd, Gene G.; Freeman, Tarsh; Buta, Ronald J. +1 more
The spiral galaxy NGC4622 was recognized by Byrd et al. (1989, Celest. Mech., 45, 31) to have a single inner arm winding outward counterclockwise (CCW) and an outer pair of arms winding outward clockwise (CW). Using HST and ground-based observations, Buta et al. (2003, AJ, 125, 634) used a dust silhouette method to determine that the disk of NGC46…
Tests of Broadband Photometric Consistency for Standard Stars, the Hyades, and M67
Joner, Michael D.; van Wyk, Francois; Taylor, Benjamin J. +1 more
New South African Astronomical Observatory (SAAO) BV(RI)C measurements of 19 Hyades stars and 11 M67 stars are reported. The zero points of the new color indices conform closely to those of SAAO data reported in a previous paper. In addition, the new M67 measurements of (V - R)C and (R - I)C are compared to data pu…
First Orbits for Five Binaries
Cvetković, Z.
In this paper, new orbital elements are given for five binaries. For all of them—Washington Double Star (WDS) 00469+4339 = HDS 102, WDS 02186+4017 = EGG 2Aa, WDS 05542 - 2909 = FIN 382, WDS 06493- 0216 = FIN 322, and WDS 11495 - 4604 = FIN 366—the orbital elements are calculated for the first time. One of the five binaries, HDS 102, was discovered…
The Non-Thermal Radio Jet Toward the NGC 2264 Star Formation Region
Rodríguez, Luis F.; Trejo, Alfonso
We report sensitive VLA 3.6 cm radio observations toward the head of the Cone Nebula in NGC 2264, made in 2006. The purpose of these observations was to study a non-thermal radio jet recently discovered, which appears to emanate from the head of the Cone Nebula. The jet is highly polarized, with well-defined knots, and one-sided. Comparison of our…
Refining the Parallax in Visual Double Stars Using Orbital and Spectral Data: Application to the System of the K0 Giants, A 1808
Docobo, J. A.; Andrade, M.; Tamazian, V. S. +2 more
In this paper, we show how Hipparcos parallaxes of distant visual binaries (πHip <~ 10 mas) can be refined. This is accomplished by using relevant orbital and spectral data. To this end, we study the pair of K0 giants, A 1808. A revised orbit of this system is presented that was calculated by taking into account a set of interferomet…
Hubble Space Telescope Imaging of Bright Lyman Break Galaxy Candidates from the Sloan Digital Sky Survey: not Lbgs after all
Pogge, Richard W.; Bentz, Misty C.; Osmer, Patrick S.
We present deep Hubble Space Telescope ACS and NICMOS images of six bright Lyman break galaxy candidates that were previously discovered in the Sloan Digital Sky Survey. We find that five of the objects are consistent with unresolved point sources. Although somewhat atypical of the class, they are most likely LoBAL quasars, perhaps FeLoBALs. The s…
Star Clusters in the Nearby Late-Type Galaxy NGC 1311
de Grijs, Richard; Windhorst, Rogier A.; Eskridge, Paul B. +3 more
Ultraviolet, optical and near-infrared images of the nearby (D ≈ 5.5 Mpc) SBm galaxy NGC 1311, obtained with the Hubble Space Telescope, reveal a small population of 13 candidate star clusters. We identify candidate star clusters based on a combination of their luminosity, extent, and spectral energy distribution. The masses of the cluster candida…
Cats: Optical to Near-Infrared Colors of the Bulge and Disk of Two z = 0.7 Galaxies Using Hubble Space Telescope and Keck Laser Adaptive Optics Imaging
Simard, L.; Koo, D. C.; Larkin, J. E. +5 more
We have employed laser guide star (LGS) adaptive optics (AO) on the Keck II telescope to obtain near-infrared (NIR) images in the Extended Groth Strip deep galaxy survey field. This is a continuation of our Center for Adaptive Optics Treasury Survey program of targeting 0.5 < z < 1 galaxies where existing images with the Hubble Space Telesco…
a Three-Dimensional Orbit for Capella
Branham, Richard L.
Semidefinite programming is applied to 169 interferometric observations of Capella, made between 1919 and 1999, and 221 double-line radial velocities, obtained between 1896 and 1991, to calculate a three-dimensional orbit. The data are reduced with the robust L 1 criterion. The orbit is nearly circular, eccentricity of 0.00508, with a s…