Search Publications
Properties of the Young Stellar Object N 160 A-IR
Siebenmorgen, R.; Stecklum, B.; Fitzpatrick, E. L. +3 more
We present near- and mid-infrared images of the young stellar object N 160 A-IR in the Large Magellanic Cloud (LMC). For the first time, the YSO is seen in the NIR as a compact point source in the north-western part of the H ii region N 160 A. Furthermore, we present ISO-SWS spectra pointed on the YSO. The spectra cover the full wavelength range o…
HST/WFPC2 observation of the core of M 3: Blue objects and the position of the radio source
Ferraro, F. R.; Fusi Pecci, F.; Laget, M. +1 more
HST/WFPC2 images of the central part of the globular cluster M 3 (NGC 5272) in UV (F255W), U (F336W), V (F555W) and I (F814W) are used to search for faint blue stars down to an UV magnitude slightly below the turnoff level. Three low-luminosity blue stars are found in the PC1 field of view; two are new detections. All are within ~ 10arcsec from th…
Insights into the accretion flow in QS Telescopii (RE1938-461) from HST observations
Gänsicke, B. T.; de Martino, D.; Mason, K. O. +3 more
We present HST/FOS observations of the polar QS Tel (RE1938-461) revealing new details in its 140min UV orbital variability. A colour-dependent continuum orbital modulation as well as a narrow dip in its light curve, occurring at the same orbital phases as the one detected in the EUVE band, are observed. Their spectral dependence allows us to iden…
On the use of HIPPARCOS data for the determination of astrometric positions of outer planets
Fienga, Agnes
We investigated the improvement of observed astrometric positions of outer planets by use of Hipparcos Catalogue stars and satellite measurements. Positions of Jupiter from photographic plates were obtained, indirectly, from measurements of the Galilean satellites, using the G5 ephemerides of Bureau des Longitudes. The use of Hipparcos data in the…
Fe II emission lines in the UV spectrum of Sirius-A and VEGA
Ferlet, R.; Vidal-Madjar, A.; Lanz, T. +4 more
We present high-quality HST/GHRS spectra in the Hydrogen Lalpha spectral region of Vega and Sirius-A. Thanks to the signal-to-noise ratio achieved in these observations and to the similarity of the two spectra, we found clear evidence of emission features in the low flux region, lambda lambda 1190-1222 Angstroms. These emission lines can be attrib…
The O V 1213.9 Angstroms forbidden line in the quiet Sun
Curdt, W.; Mathioudakis, M.; Keenan, F. P. +2 more
We present the first unambiguous detection of the O v 1213.9 Angstrom (2s(2) (1) S_0 -> 2s2p (3) P_2) forbidden line in the solar spectrum, using observations obtained with the SUMER instrument on board SOHO. The wavelength separation of the forbidden to the (2s(2) (1) S_0 -> 2s2p (3) P_1) intercombination line at 1218.35 Angstroms is 4.5+/-…
IUE low-resolution observations of the triple system CHCygni: the mass transfer in the symbiotic pair
Bode, M. F.; Drechsel, H.; Skopal, A. +1 more
We present and analyse UV low-resolution spectra of CHCyg taken during the whole period of the International Ultraviolet Explorer (IUE) mission. Our analysis of the variation in the UV/optical hot star continuum confirmed the basic scenario of sporadic accretion in the symbiotic pair of the triple-star system as being responsible for maintaining i…
[\ion(C)(ii)] 158 and [\ion(O)(i)] 63 MU M ISO-Observations of L1457
Timmermann, Ralf; Koester, Benedikt; Stutzki, Juergen
We report here the results of [C Ii] 158 and [O I] 63 mu m fine-structure line observations along two cuts across a molecular clump of L1457 (MBM 12) carried out with ISO-LWS. [C Ii] emission was detected at all positions observed. It can be assigned to the cooling of the diffuse atomic interstellar medium. We observed excess [C Ii] emission from …
An ISO view on interstellar dust heated by red giant stars
Epchtein, N.; Boulanger, F.; Lagache, G. +4 more
In order to study the structure and emission of the diffuse interstellar medium when it is heated by red giant stars, we have obtained ISOPHOT maps centered at proximity of a sample of such objects. The maps are 7'x7' with a pixel size of 45'', and were made at 60 and 90 mu m. Here we present the preliminary results of this program, based on data …
Are low-order resonances observed in Mira pulsation?
Barthes, D.; Mennessier, M. O.; Vidal, J. L. +1 more
The possibility of a low-order, two-mode resonance in the pulsation of LPVs is investigated by means of Fourier analysis of lightcurves, supplemented by spectral types and by kinematic population analysis based on HIPPARCOS astrometric data. The question might be positively answered. Based on data from the HIPPARCOS astrometry satellite.