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Metal abundances of field A and Am stars
Hui-Bon-Hoa, A.
Detailed abundances of 9 field A and Am stars are derived for Mg, Ca, Sc, Cr, Fe, and Ni using high resolution spectroscopy. Most of our sample Am stars show the characteristic deficiencies of Ca and Sc on one hand, and the overabundances of the iron peak elements on the other, which is consistent with the predictions of the diffusion model for Ma…
Hipparcos astrometry for 257 stars using Tycho-2 data
Makarov, V. V.; Fabricius, C.
We present improved Hipparcos astrometry for 257 Hipparcos stars, resolved into 342 components. For 64 of the stars no astrometry was obtained in the Hipparcos Catalogue, while for the remaining stars additional components have been added by this solution or the positions have been revised considerably. We have used the published Hipparcos transit…
Atomic data from the IRON Project. XL. Electron impact excitation of the Fe XIV EUV transitions
Young, P. R.; Mason, H. E.; Storey, P. J.
We calculate collision strengths and thermally averaged collision strengths for electron excitation between the forty energetically lowest levels of Fe13+. The scattering calculation is more complete than any previous work on this ion and significant differences are found in the excitation rates for many of the extreme ultra-violet (EUV…
The INES system. III. Evaluation of IUE NEWSIPS high resolution spectra
Altamore, A.; Solano, E.; Wamsteker, W. +2 more
This paper discusses the overall quality of IUE high resolution data processed with the NEWSIPSlinebreak software in terms of flux and wavelength accuracy. It also describes the processing of NEWSIPS high resolution spectra within the framework of the ESA ``IUE Newly Extracted Spectra'' (INES) System. This system provides the IUE high resolution d…
Near-infrared probing of embedded structures in starburst and Seyfert galaxies
Martinet, L.; Martin, P.; Wozniak, H. +2 more
Surface photometry in the J and K' bands of 15 southern Seyfert or starburst galaxies is presented. The detailed central morphology and structural properties of these objects were analyzed by fitting ellipses to isophotes. New central peculiar structures have been identified like, for instance, three double-barred systems (ESO 215-G031;…
Optimizing ISOCAM data processing using spatial redundancy
Miville-Deschênes, M. -A.; Boulanger, F.; Abergel, A. +1 more
Several instrumental effects of the Long Wavelength channel of ISOCAM, the camera on board the Infrared Space Observatory, degrade the processed images. We present new data-processing techniques that correct these defects, taking advantage of the fact that a position in the sky has been observed by several pixels at different times. We use this re…
Mapping the star formation history of Mrk 86. I. Data and models
Gallego, J.; Zamorano, J.; Gil de Paz, A. +1 more
We have obtained optical (BVR, [O Iii]lambda 5007 Å and Hα ), near infrared (JHK) imaging and long-slit optical spectroscopy for the Blue Compact Dwarf galaxy
The INES system. II. Ripple correction and absolute calibration for IUE high resolution spectra
Talavera, A.; Altamore, A.; Wamsteker, W. +4 more
In this paper we document the results of the study which led to the ripple correction and absolute calibration algorithms applied to the high resolution spectra processed with the NEWSIPS software for the Final Archive of the IUE Project. In this analysis, based on a very large number of spectra, we find that both the K and alpha parameters (not o…
Blind source separation and analysis of multispectral astronomical images
Bijaoui, A.; Nuzillard, D.
Celestial sources are studied by means of multispectral analysis, for which a pixel value can be considered as a mixture of different sources. We show that the application of blind source separation methods can display interesting features, which can help astronomers to improve their description of celestial sources. Experiments were carried out o…
ISOCAM observations of the very deep IRAS 60 micron sample in the NEP region. I. The data
Aussel, H.; Franceschini, A.; De Zotti, G. +2 more
We present the results of ISO observations with the CAM LW3 filter, centered at lambda_eff = 14.3 mu m, of 94 out of the 98 galaxies comprising the complete 60 mu m IRAS deep survey (IDS) sample in the north ecliptic polar region. In addition, we observed a source detected by IRAS at 25 mu m and found to have particularly interesting properties. A…