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NGC 5953/54: BVRIHαJK photometry and [N II] Fabry-Perot interferometry. I. The data
Rosado, M.; Dultzin-Hacyan, D.; Fuentes-Carrera, I. +3 more
We present new BVRIHαJK imaging and [N II] scanning Fabry-Perot observations for the interacting galaxy pair NGC 5953/54. Morphology is reviewed using a combination of contrast-enhanced images, color-index maps, and geometric (radial µ ɛ = 1 - b/a, PA and a4/a) profile parameters. Our data are complemented by archived V/R/H images…
Deep ISOPHOT far-infrared imaging of M 86
Fabian, A. C.; Bregman, J. N.; Elmegreen, D. M. +2 more
Deep far-infrared (FIR) imaging data obtained with ISOPHOT at 60 µm, 90 µm, 150 µm, and 180 µm reveal a complex FIR morphology of the Virgo cluster elliptical M 86 (NGC 4406). A close pair of sources is associated with the centre of the M 86 galaxy and optically discovered dust streamers. Both components have a cold FIR spe…
The corona of HD 223460 (HR 9024)
Gondoin, P.
HD 223460 (HR 9024), a chromospherically active late-type giant with a high X-ray luminosity, was observed by the XMM-Newton space observatory. Series of lines of highly ionized Fe and several Lyman lines of hydrogen-like ions and triplet lines of helium-like ions are visible in the reflection grating spectra, most notably from O and Ne. Analysis …
Shock emission in the bipolar post-AGB star IRAS 16594-4656
van Hoof, P. A. M.; Van de Steene, G. C.
In this paper we study the near-infrared emission spectrum of IRAS 16594-4656, a bipolar post-AGB star with spectral type B7 and no observed ionization. Using optical and near-infrared photometry we determined the total extinction towards this object to be AV= 7.5+/-0.4 mag and derived a distance of 2.2+/-0.4 kpc, assuming a luminosity …
Sizes of quiet Sun transition region structures
Peter, H.; Gontikakis, C.; Dara, H. C.
We studied the morphology of the transition region of the quiet Sun, with data obtained by the Solar Ultraviolet Measurements of Emitted Radiation spectrometer (SUMER) and the Extreme-Ultraviolet Imaging Telescope (EIT), in September 1996. We analyzed lines emitted in the chromosphere, the low transition region and the low corona. We computed the …
Evidence for a Flux Rope driven EUV wave and CME: Comparison with the Piston Shock Model
Foley, C. R.; Culhane, J. L.; Harra, L. K. +2 more
This paper examines the relationship between a coronal wave, filament eruption, flare and Coronal Mass Ejection (CME) which occurred on 2001, April 10th. We study the pre-flare activity which includes the eruption of a filament and a coronal wave. A large X-ray flare and a CME follow. We discuss how these phenomena are related and compare our resu…
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…
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…
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…