Search Publications
Ongoing Mass Transfer in the Interacting Galaxy Pair NGC 1409/1410
Keel, William C.
I present two-band Hubble Space Telescope (HST) STIS imaging and WIYN spectral mapping of ongoing mass transfer in the interacting galaxy pair NGC 1409/1410 (where NGC 1410 is the Seyfert galaxy also cataloged as III Zw 55). Archival snapshot WFPC2 imaging from the survey by Malkan and coworkers showed a dust feature stretching between the galaxie…
New and Confirmed Triple Systems with Luminous Cool Primaries and Hot Companions
Parsons, Sidney B.
In the course of comparing parameters of evolved cool star plus hot main-sequence star binaries with theoretical isochrones, some discrepancies are found between implied stellar masses and the spectroscopic binary mass function or the measured angular separation. These are naturally explained if there is a third star in the system. Multiplicity is…
The Ultraviolet Spectrum of the High-Field Magnetic Cataclysmic Variable AR Ursae Majoris
Gänsicke, B. T.; Szkody, Paula; Hoard, D. W. +4 more
We have obtained an ultraviolet spectrum covering the range 917-1182 Å of the high-field magnetic cataclysmic variable AR Ursae Majoris when the binary was in its typical low-accretion state. The data reveal an array of deep Zeeman absorption features due to hydrogen Lyα-Lyγ, including several transitions that are normally forbidden but become ena…
The Luminous Erupting Dwarf Nova CV 1 in the Dense Globular Cluster M15
Zurek, David R.; Hinkley, Sasha; Bond, Howard E. +2 more
Despite decades-old predictions of the expected presence of dozens of cataclysmic variables in the cores of globular clusters, the number of irrefutable, outbursting candidates is still barely a handful. Using multiwavelength, multiepoch Hubble Space Telescope images, we have produced outburst and quiescence light curves for the recently discovere…
Synthetic Spectral Analysis of the Hot Component in the S-Type Symbiotic Variable EG Andromedae
Sion, Edward M.; Mikołajewska, Joanna; Kolb, Kelly +1 more
We have applied grids of non-LTE (NLTE) high-gravity model atmospheres and optically thick accretion disk models for the first time to archival IUE and FUSE spectra of the S-type symbiotic variable EG Andromedae taken at superior spectroscopic conjunction, when Rayleigh scattering should be minimal and the hot component is viewed in front of the r…
Hubble Space Telescope Astrometric Observations and Orbital Mean Motion Corrections for the Inner Satellites of Neptune
Pascu, Dan; Rohde, James R.; Seidelmann, P. Kenneth +6 more
Six small inner satellites of Neptune were imaged in 1989 with Voyager 2. In 1997, we recovered the four outermost with the Hubble Space Telescope (HST) Wide Field Planetary Camera 2 for astrometric, dynamical, and photometric studies. The ring arcs were not detected in our images. Thirteen exposures were taken in each of three HST orbits: two orb…
Searching for Variability in the Globular Cluster Messier 4
Ibata, Rodrigo A.; Rich, R. Michael; Gibson, Brad K. +11 more
Time-series data taken with the Hubble Space Telescope of a field six core radii (~5') from the center of the globular cluster Messier 4, and covering a period of about 10 weeks in early 2001, have been analyzed in search of variable objects. Various criteria were employed to select candidate variable stars. Period searches were performed on the s…
Secular Trends in the Mean Longitudes of Planets Derived from Optical Observations
Kolesnik, Yuri B.; Masreliez, C. Johan
About 240,000 worldwide optical observations of the Sun, Mercury, and Venus, accumulated during the entire era of classical astrometry from James Bradley up to the present, are used to analyze the secular longitude variations of the innermost planets. A reduction method relating historical planetary observations to the Hipparcos reference frame is…
Faint 6.7 Micron Galaxies and Their Contributions to the Stellar Mass Density in the Universe
Matsuhara, Hideo; Cowie, Lennox L.; Taniguchi, Yoshiaki +6 more
We discuss the nature of faint 6.7 µm galaxies detected with the mid-infrared camera ISOCAM on board the Infrared Space Observatory (ISO). The 23 hr integration on the Hawaii Deep Field SSA13 has provided a sample of 65 sources down to 6 µJy at 6.7 µm. For 57 sources, optical or near-infrared counterparts were found using a stati…