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Chromospheric imaging of the active binary system V 711 Tauri = HR 1099 in December 1992
Pagano, I.; Lanzafame, A. C.; Rodonò, M. +2 more
Spectroscopic observations of the bright RS CVn-type system V 711 Tau = HR 1099 (K1 IV + G5 V) were obtained by IUE during the same period of a Multi-Site Continuous Spectroscopy (MUSICOS) campaign between 12-18 December 1992 (Huang et al. 1995). We report on the results of a ``Doppler Imaging" analysis of the Mg II h line. Broad, variable and ext…
SN 1994D in NGC 4526: a normally bright type IA supernova
Richtler, Tom; Drenkhahn, Georg
H2O from R Cas: ISO LWS-SWS observations and detailed modelling
Justtanont, K.; Barlow, M. J.; Tielens, A. G. G. M. +7 more
We present 29-197 mu m spectra of the oxygen-rich Mira variable star, R Cas, obtained with the Long- and Short- Wavelength Spectrometers (LWS and SWS) on board the Infrared Space Observatory (ISO). The LWS grating observations were made during two pulsational stellar phases, phi { ~ } 0.5 and 0.2 in August 1996 and June 1997 when the stellar lumin…
The carbon star IRAS 15194-5115: circumstellar CO radio and FIR rotational lines
Ryde, N.; Olofsson, H.; Schöier, F. L.
We have modelled radio and far-infrared rotational lines of 12CO and 13CO obtained from the circumstellar envelope of the infrared-bright carbon star
Radius and distance estimates of the isolated neutron stars Geminga and PSR B0656+14 using optical photometry
Golden, A.; Shearer, A.
Integrated ground-based and HST optical studies of isolated neutron stars have provided important independent datasets in the determination of emission activity, particularly in the fitting of anticipated Rayleigh-Jeans extrapolations from EUV/soft X-ray datasets, despite their intrinsic faintness. Differentiation of the pulsed and unpulsed fluxes…
The steep spectrum quasar PG1404+226 with ASCA, HST and ROSAT
Comastri, A.; Komossa, S.; Crane, P. +1 more
We present and discuss our observations of the Narrow Line quasar PG1404+226 (zem = 0.098) with ASCA and HST, and a re-analysis of our earlier observations with ROSAT. The soft X-ray spectrum is very steep and displays an absorption feature (edge or line at ~ 1.1 keV). We have applied a variety of models to the ASCA and ROSAT spectra wi…
The 10-200 MU M spectral energy distribution of the prototype narrow-line X-ray galaxy NGC 7582
Lemke, D.; Radovich, M.; Acosta-Pulido, J. +1 more
We present the spectral energy distribution (SED) between 10 and 200 mu m obtained for the prototype narrow-line X-ray galaxy NGC 7582 with ISOPHOT, the photometer on board the Infrared Space Observatory. The emission is spatially extended and we separated for the first time the nuclear and extranuclear infrared SEDs. The nuclear luminosity (L_IR …
The iron abundance in hot central stars of planetary nebulae derived from IUE spectra
Rauch, T.; Werner, K.; Dreizler, S. +1 more
We present the first attempt to determine the iron abundance in hot central stars of planetary nebulae. We perform an analysis with fully metal-line blanketed NLTE model atmospheres for a sample of ten stars (T_eff >~ 70 000 K) for which high-resolution UV spectra are available from the IUE archive. In all cases lines of Fe Vi or Fe Vii can be …
The ISO spectrum of the planetary nebula NGC 6302. I. Observations
Pottasch, S. R.; Beintema, D. A.
The spectrum of the planetary nebula NGC 6302 is presented, as it was observed by the ISO short-wavelength spectrometer. The IUE spectrum observed at the same position with the same aperture is also presented.
Metallicity-dependent effective temperature determination for eclipsing binaries from synthetic UVBY Strömgren photometry
Westera, P.; Buser, R.; Lastennet, E. +1 more
Strömgren synthetic photometry from an empirically calibrated grid of stellar atmosphere models has been used to derive the effective temperature of each component of double lined spectroscopic (SB2) eclipsing binaries. For this purpose, we have selected a sub-sample of 20 SB2s for which (b-y), m_1, and c_1 individual indices are available. This n…