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Multimodal Distributions along the Horizontal Branch
Ferraro, Francesco R.; Paltrinieri, Barbara; Fusi Pecci, Flavio +2 more
We report on the Hubble Space Telescope (HST) Wide Field Planetary Camera 2 (WFPC2) U, V, and far-ultraviolet observations of three galactic globular clusters (GGCs), NGC 5272 = M3, NGC 6205 = M13, and NGC 6093 = M80. Two of these clusters (namely, M13 and M80) have horizontal-branch (HB) tails that extend to the helium-burning main sequence, with…
A Z = 5.34 Galaxy Pair in the Hubble Deep Field
Dey, Arjun; Bunker, Andrew; Spinrad, Hyron +5 more
We present spectrograms of the faint V-drop (V_606 = 28.1, I_814 = 25.6) galaxy pair HDF 3-951.1 and HDF 3-951.2 obtained at the Keck II Telescope. In a recent study, Fernández-Soto, Lanzetta, & Yahil derive a photometric redshift of z_ph=5.28^+0.34_-0.41 (2 sigma) for these galaxies; our integrated spectrograms show a large and abrupt discont…
Hubble Space Telescope Wide Field Planetary Camera 2 Observations of eta Carinae
Frank, Adam; Davidson, Kris; Bally, John +3 more
Hubble Space Telescope (HST) continuum and emission-line images of eta Carinae obtained with the Planetary Camera (PC) of the Wide Field Planetary Camera 2 show a startling wealth of detailed structure in the expanding Homunculus Nebula and outer debris field. Using a combination of dithering and image deconvolutions, we have achieved a resolution…
The AC 2000: The Astrographic Catalogue on the System Defined by the HIPPARCOS Catalogue
Urban, S. E.; Wycoff, G. L.; Martin, J. C. +4 more
The AC 2000 is a positional catalog of 4,621,836 stars covering the entire sky. The average epoch of position is 1907. The data are from the images measured and published as part of the Astrographic Catalogue (AC). The positions are on the system defined by the Hipparcos Catalogue, having originally been reduced plate-by-plate using the Astrograph…
The ROSAT all-sky survey catalogue of optically bright main-sequence stars and subgiant stars
Schmitt, J. H. M. M.; Voges, W.; Huensch, M.
We present X-ray data for all main-sequence and subgiant stars of spectral types A, F, G, and K and luminosity classes IV and V listed in the Bright Star Catalogue that have been detected as X-ray sources in the ROSAT all-sky survey; several stars without luminosity class are also included. The catalogue contains 980 entries yielding an average de…
The shape of the unidentified infra-red bands: analytical fit to ISOCAM spectra
Boulanger, F.; Cesarsky, D.; Ryter, C. +1 more
Modelling the unidentified infrared dust bands at 6.2 7.7, 8.6, 11.3, and 12.7 µm by Lorentz profiles is shown to produce excellent fits to the spectra obtained with the Continuous Variable Filter (CVF) of the instrument ISOCAM, on-board the Infrared Space Observatory (ISO). The feature pedestals are accounted for by the wide wings of the Lo…
Rotating Transition Region Features Observed with the SOHO Coronal Diagnostic Spectrometer
Mason, H. E.; Pike, C. D.
Strong evidence has been found from SOHO-CDS (Solar and Heliospheric Observatory - Coronal Diagnostic Spectrometer) observations to support the hypothesis that rotation plays a major role in the dynamics of transition region features. A comprehensive survey of the CDS daily synoptic rasters has been carried out to select dynamic events by searchin…
An Infrared Einstein Ring in the Gravitational Lens PG 1115+080
Peng, C. Y.; Keeton, C. R.; Kochanek, C. S. +5 more
Hubble Space Telescope observations of the gravitational lens PG 1115+080 in the infrared show the known zl = 0.310 lens galaxy and reveal the zs = 1.722 quasar host galaxy. The main lens galaxy G is a nearly circular (ellipticity ɛ < 0.07) elliptical galaxy with a de Vaucouleurs profile and an effective radius of Re<…
NICMOS Imaging of the Nuclei of Arp 220
Scoville, N. Z.; Evans, A. S.; Schneider, G. +8 more
We report high-resolution imaging of the ultraluminous infrared galaxy Arp 220 at 1.1, 1.6, and 2.22 µm with the Near-Infrared Camera and Multiobject Spectrometer on the Hubble Space Telescope. The diffraction-limited images at 0.1"-0.2" resolution clearly resolve both nuclei of the merging galaxy system and reveal for the first time a numbe…
Cold dust in the Andromeda Galaxy mapped by ISO
Lemke, D.; Haas, M.; Hippelein, H. +4 more
A complete 175 mu m map of the Andromeda galaxy (M31) at 1farcm 3 resolution shows the distribution of cold dust. It is dominated by a ring at 10 kpc radius supplemented by a faint outer one at 14 kpc. No clear spiral pattern is recognisable. The azimuthally averaged radial brightness profile is rather flat within the 10 kpc ring and decreases exp…