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A very young star forming region detected by the ISOPHOT Serendipity Survey
Krause, O.; Lemke, D.; Klaas, U. +4 more
We present a multi-wavelength study of the star forming region ISOSS J 20298+3559, which was identified by a cross-correlation of cold compact sources from the 170 mu m ISOPHOT Serendipity Survey (ISOSS) database coinciding with objects detected by the MSX, 2MASS and IRAS infrared surveys. ISOSS J 20298+3559 is associated with a massive dark cloud…
Infrared Space Observatory Long-Wavelength Spectrometer Spectroscopy of Star-forming Regions in M33
Stacey, G. J.; Higdon, S. J. U.; Higdon, J. L. +1 more
We present Infrared Space Observatory (ISO) Long-Wavelength Spectrometer (LWS) far-infrared (FIR) spectra of the nucleus and six giant H II regions in M33 (NGC 595, IC 142, NGC 592, NGC 604, NGC 588, and IC 133). The seven fine-structure lines observed in the FIR are used to model the H II and photodissociation regions (PDRs). There is no observed…
The active quiescence of HR Del (Nova Del 1967). The ex-nova HR Del
Selvelli, P.; Friedjung, M.
This new UV study of the ex-nova HR Del is based on all of the data obtained with the International Ultraviolet Explorer (IUE) satellite, and includes the important series of spectra taken in 1988 and 1992 that have not been analyzed so far. This has allowed us to make a detailed study of both the long-timescale and the short-timescale UV variatio…
A study of lambda Bootis type stars in the wavelength region beyond 7000 Å
Kamp, I.; Paunzen, E.; Wiesemeyer, H. +1 more
The group of lambda Bootis type stars comprises late B- to early F-type, Population I objects which are basically metal weak, in particular the Fe group elements, but with the clear exception of C, N, O and S. One of the theories to explain the abundance pattern of these stars involves circumstellar or interstellar matter around the objects. Hence…
Iterative Techniques for the Decomposition of Long-Slit Spectra
Walsh, J. R.; Lucy, L. B.
Two iterative techniques are described for decomposing a long-slit spectrum into the individual spectra of the point sources along the slit and the spectrum of the underlying background. One technique imposes the strong constraint that the spectrum of the background be spatially invariant; the other relaxes this constraint. Both techniques are app…
Submillimetre and near-infrared observations of galaxies selected at 170 µm
Dole, H.; Lagache, G.; Puget, J. -L. +5 more
We present results from James Clerk Maxwell Telescope (JCMT) submillimetre (submm) observations of sources selected from the Infrared Space Observatory (ISO) FIRBACK (Far-infrared Background) survey, along with United Kingdom Infrared Telescope (UKIRT) near-infrared imaging of a subsample. This gives valuable insight into the brightest ~10 per cen…
Hubble Space Telescope/NICMOS Near-Infrared Imaging of the Proto-Planetary Nebula OH 231.8+4.2
Hora, J. L.; Tielens, A. G. G. M.; Latter, W. B. +2 more
We present observations of the bipolar nebula OH 231.8+4.2, made with the Hubble Space Telescope (HST) NICMOS camera, in three wide filter bands (F205W, F160W, and F110W). The images have excellent dynamic range after removal of low-level instrumental artifacts. In the F205W filter (λ~2.04 µm), we achieve a peak/rms of greater than 8000 with…
The 2001 April Burst Activation of SGR 1900+14: Pulse Properties and Torque
Frontera, F.; Hurley, K.; Mereghetti, S. +10 more
We report on observations of SGR 1900+14 made with the Rossi X-Ray Timing Explorer (RXTE) and BeppoSAX during the 2001 April burst activation of the source. Using these data, we measure the spin-down torque on the star and confirm earlier findings that the torque and burst activity are not directly correlated. We compare the X-ray pulse profile to…
The Wilson-Bappu effect: A tool to determine stellar distances
Pasquini, L.; Ortolani, S.; Pace, G.
Wilson & Bappu (\cite{orig}) have shown the existence of a remarkable correlation between the width of the emission in the core of the K line of Ca II and the absolute visual magnitude of late-type stars.
Here we present a new calibration of the Wilson-Bappu effect based on a sample of 119 nearby stars. We use, for the first time, width m…Common overabundance of 3He in high-energy solar particles
Torsti, J.; Kocharov, L.; Laivola, J.
Solar energetic particle (SEP) observations of the ERNE instrument (the Energetic and Relativistic Nuclei and Electron experiment) onboard the Solar and Heliospheric Observatory enable measurements of the 3He intensity in the high-energy range, >15 MeV nucleon-1, with a good statistical resolution. We report an overview of…