Search Publications
Missions
Journals
Publication Years
Very cold dust in the peculiar dwarf elliptical galaxy NGC 205
Haas, Martin
ISO observations of NGC 205 between 120 and 200 mu m resolve the emission from 20-24 K cold dust. It is extended to about 7farcm 5x7farcm 5 with bright concentrations in a 1farcm 5 north-south elongated area, similar to the that seen in HI. Supplemented by IRAS and mm literature data, the photometry of the total galaxy and the central region is di…
A comparison of HIPPARCOS parallaxes with planetary nebulae spectroscopic distances
Pottasch, S. R.; Acker, A.
The Hipparcos satellite has measured the parallax of a small sample of planetary nebulae. In this paper we consider the results for 3 planetary nebulae (PN) for which spectroscopic distances have also been determined from stellar gravities. These gravities in turn have been derived from profile fitting of selected hydrogen and helium lines (Mendez…
Discovery of a New Quadruple Lens HST 1411+5211
Barrientos, L. Felipe; Fischer, Philippe; Schade, David
Gravitational lensing is an important tool for probing the mass distribution of galaxies. In this Letter, we report the discovery of a new quadruple lens HST 1411+5211 found in archived Wide-Field Planetary Camera 2 images of the galaxy cluster CL 140933+5226. If the galaxy is a cluster member, then its redshift is z=0.46. The images of the source…
Late-type dwarf galaxies in the Virgo cluster - I. The samples
Brosch, Noah; Almoznino, Elchanan
We selected samples of late-type dwarf galaxies in the Virgo cluster with HI information. The galaxies were observed at the Wise Observatory using several broad-band and Hα bandpasses. UV measurements were carried out with the IUE Observatory from VILSPA, and with the FAUST shuttle-borne UV telescope. We describe the observations in detail, paying…
Filament Observations with SOHO Sumer/cds: The Behaviour of Hydrogen Lyman Lines
Heinzel, P.; Vial, J. -C.; Schmieder, B. +1 more
On 21 September 1996, a filament close to an area of enhanced network was observed with the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer and Coronal Diagnostic Spectrometer (CDS). CDS provided intensity, Doppler shift and linewidth maps of the region in six lines whose temperature range covers 104 to 106…
ISO-SWS Spectra of OH/IR Stars
Waters, L. B. F. M.; Yamamura, I.; de Jong, T. +2 more
We present the spectra of 5 OH/IR stars observed with the Short Wavelength Spectrometer (SWS) on board the Infrared Space Observatory (ISO). The spectra are dominated by dust features, both in the amorphous and crystalline state and illustrate the influence of the mass loss rate on the observed spectral features.
Hubble Space Telescope Wide Field Planetary Camera 2 Observations of the Young Bipolar H II Region S106
Bally, John; Zinnecker, Hans; Rayner, John +1 more
We present narrowband Hubble Space Telescope Wide Field Planetary Camera 2 images of the bipolar H ii region S106 in the Hα line. The high-resolution images show unprecedented detail in the two nebular lobes, including prominent scalloped structure of the emission at the ionization front. The illuminating source of the nebula, S106 IR, is detected…
A comparison of recurrent energetic ion enhancements observed at Ulysses and at 1 AU by IMP 8 and SAMPEX: Ulysses launch until following the first north polar passage
Mason, G. M.; Richardson, I. G.; Mazur, J. E.
During the Ulysses mission, the Goddard Space Flight Center instrument on IMP 8 and the University of Maryland low energy ion composition analyzer instrument on SAMPEX observed recurrent MeV/amu ion enhancements in the ecliptic plane at 1 AU. We identify those IMP 8/SAMPEX events related to the recurrent events observed at Ulysses from its launch …
Spectroscopic and photometric investigations of MAIA candidate stars
Lehmann, H.; Scholz, G.; Hildebrandt, G. +2 more
Including our own observational material and the Hipparcos photometry data, we investigate the radial velocity and brightness of suspected Maia variable stars which are classified also in some examples as peculiar stars, mainly for the existence of periodic variations with time-scales of hours. The results lead to the following conclusions: (1) Sh…
Pulsation Modes in Small-Amplitude Red Variable Stars
Percy, John R.; Parkes, Michael
We have investigated the pulsation modes of small-amplitude red variables with well-determined periods and accurate Hipparcos parallaxes by comparing observational and theoretical Q-values. In our sample of 13 stars, one appears to be pulsating in the third overtone, nine in the first or second overtone, and three in the fundamental or first overt…