Search Publications
High-Resolution Observations of Interstellar Ca I Absorption-Implications for Depletions and Electron Densities in Diffuse Clouds
Welty, Daniel E.; Hobbs, L. M.; Morton, Donald C.
We present high-resolution (FWHM~0.3-1.5 km s-1) spectra, obtained with the AAT UHRF, the McDonald Observatory 2.7 m coudé spectrograph, and/or the KPNO coudé feed, of interstellar Ca I absorption toward 30 Galactic stars. Comparisons of the column densities of Ca I, Ca II, K I, and other species-for individual components identified in …
An IUE Atlas of Pre-Main-Sequence Stars. III. Co-added Final Archive Spectra from the Long-Wavelength Cameras
Valenti, Jeff A.; Johns-Krull, Christopher M.; Fallon, Adam A.
We identified 137 T Tauri stars (TTS) and 97 Herbig Ae/Be (HAEBE) stars observed by IUE in the wavelength interval 1900-3200 Å. Each low-resolution (R~6 Å) spectrum was visually inspected for source contamination and data quality, and then all usable spectra were combined to form a single time averaged spectrum for each star. For sources with mult…
Space Telescope Imaging Spectrograph Spectroscopy of the Emission-Line Gas in the Nuclei of Nearby FR-I Galaxies
Baum, Stefi A.; O'Dea, Christopher P.; van der Marel, Roeland P. +4 more
We present the results of the analysis of a set of medium-resolution spectra, obtained by the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope, of the emission-line gas present in the nuclei of a complete sample of 21 nearby, early-type galaxies with radio jets (the UGC FR-I Sample). For each galaxy nucleus we present spect…
An Archive of IUE Low-Dispersion Spectra of the White Dwarf Stars
Barstow, M. A.; Holberg, J. B.; Burleigh, M. R.
We have produced an archive of the ultraviolet low-dispersion spectra for the full set of white dwarf stars observed with the International Ultraviolet Explorer (IUE) satellite over the course of its 18 yr mission. This archive contains the spectra of 322 individual degenerate stars which have been processed to optimize the signal-to-noise for eac…
Target Selection for SETI. II. Tycho-2 Dwarfs, Old Open Clusters, and the Nearest 100 Stars
Turnbull, Margaret C.; Tarter, Jill C.
We present the full target list and prioritization algorithm developed for use by the microwave search for technological signals at the SETI Institute. We have included the Catalog of Nearby Habitable Stellar Systems (HabCat, described in Paper I), all of the nearest 100 stars and 14 old open clusters. This is further augmented by a subset of the …
The Nature of Overluminous F Stars Observed in a Radial-Velocity Survey
Suchkov, A. A.; Griffin, R. F.
We have conducted a radial-velocity survey of bright (V<9), overluminous, F stars within 80 pc. The criterion of overluminosity is ΔMc0=Mc0-MV>=0.5, where MV is the absolute magnitude based on the Hipparcos parallax and Mc0 is the absolute magnitude from …
New Identifications of Mn VI and Fe VII Vacuum Ultraviolet Lines
Feldman, U.; Ekberg, J. O.
The Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer aboard the Solar and Heliospheric Observatory (SOHO) recorded a large number of spectra in the 500-1600 Å region. Although many of the detected lines have already been identified, the origins of a substantial fraction of the lines remain unknown. In this paper we report o…
Emission-Line Galaxies in the Space Telescope Imaging Spectrograph Parallel Survey. I. Observations and Data Analysis
Gardner, Jonathan P.; Teplitz, Harry I.; Rhodes, Jason +5 more
In the first 3 years of operation the Space Telescope Imaging Spectrograph (STIS) obtained slitless spectra of ~2500 fields in parallel to prime Hubble Space Telescope (HST) observations as part of the STIS parallel survey (SPS). The archive contains ~300 fields at high Galactic latitude (b>30deg) with spectroscopic exposure times gr…
Atomic Data and Spectral Line Intensities for S X
Bhatia, A. K.; Landi, E.
Electron impact collision strengths, energy levels, oscillator strengths and spontaneous radiative decay rates are calculated for S X. The configurations included are 2s22p3, 2s2p4, 2p5, 2s22p23s, 2s22p23p, and 2s22p23d giving rise to 72 f…
The Complete Far Ultraviolet Spectroscopic Explorer Spectrum of the Small Magellanic Cloud Star Sk 108
Mallouris, Christoforos
The complete FUSE spectrum of the SMC Wolf-Rayet binary star Sk 108 is presented. The spectrum covers the 905-1186 Å wavelength range at a resolution of about 12,500 and a S/N of 25-50. Detailed component information from higher resolution, UV and optical spectra is used to model the far-UV absorption lines of the ISM in the Galaxy and SMC, and sp…