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Subaru optical observations of the old pulsar PSR B0950+08
Kawai, N.; Zharikov, S. V.; Shibanov, Yu. A. +6 more
We report the B band optical observations of an old (tau ~ 17.5 Myr) radiopulsar PSR B0950+08 obtained with the Suprime-Cam at the Subaru telescope. We detected a faint object, B=27fm07 +/-0.16. Within our astrometrical accuracy it coincides with the radio position of the pulsar and with the object detected earlier by Pavlov et al. (\cite{Pavlov})…
The complete far infrared spectroscopic survey of Herbig AeBe stars obtained by ISO-LWS
Benedettini, M.; Elia, D.; Lorenzetti, D. +4 more
The ISO-LWS archive has been systematically searched in order to obtain a complete far IR spectrophotometric survey of Herbig AeBe (HAEBE) stars. The investigated sample is constituted by 15 objects which, together with the 11 HAEBE we have published in two previous papers, represents about 25% of all the known HAEBE. This catalogue constitues an …
The inner solar corona seen by SUMER, LASCO/C1, and EIT: Electron densities and temperatures during the rise of the new solar cycle
Inhester, B.; Wilhelm, K.; Newmark, J. S.
Detailed investigations of the corona and the source regions of the solar wind have become possible with spectroscopic and imaging instruments on the Solar and Heliospheric Observatory (SOHO). We present observations in the extreme ultraviolet (EUV), pertinent to the generation of the slow solar wind, which were obtained by the Solar Ultraviolet M…
Optical monitoring of the gravitationally lensed quasar Q2237+0305 from APO between June 1995 and January 1998
Stanek, K. Z.; Malhotra, S.; Rhoads, J. E. +12 more
We present a data set of images of the gravitationally lensed quasar Q2237+0305, that was obtained at the Apache Point Observatory (APO) between June 1995 and January 1998. Although the images were taken under variable, often poor seeing conditions and with coarse pixel sampling, photometry is possible for the two brighter quasar images A and B wi…
An X-ray view of the active nucleus in NGC 4258
Pietsch, W.; Read, A. M.
XMM-Newton observed the Seyfert 1.9 galaxy
The enigmatic WR46: A binary or a pulsator in disguise. II. The spectroscopy
Crowther, P. A.; van der Hucht, K. A.; van Genderen, A. M. +1 more
We present spectroscopic monitoring of the Wolf-Rayet (WR) star
First orbital elements for the lambda Bootis spectroscopic binary systems HD 84948 and HD 171948. Implications for the origin of the lambda Bootis stars
Kamp, I.; Paunzen, E.; Claret, A. +4 more
We present high-resolution spectroscopic observations of the two lambda Bootis type spectroscopic binary systems HD 84948 and HD 171948. Both systems consist of two true lambda Bootis stars, as has already been proven by a detailed abundance analysis taking into account the binary nature. Nevertheless, we have obtained non-LTE abundances for carbo…
Modeling IR spectra of OH/IR stars at different phases
Suh, Kyung-Won; Kim, H. -Y.
We investigate the spectral energy distributions (SEDs) of OH/IR stars (OH127.8+0.0 and OH26.5+0.6) having thick dust envelopes at different pulsation phases. Using new infrared observational data including the Infrared Space Observatory (ISO) data, we determine the new pulsation parameters. The deep silicate absorption features show significant v…
Diffraction-limited bispectrum speckle interferometry of the Herbig Be star R Mon
Weigelt, G.; Hofmann, K. -H.; Preibisch, T. +1 more
We explore the structures immediately surrounding the intermediate-mass young stellar object R Mon with bispectrum speckle interferometry, conventional near-infrared imaging and by analyzing optical HST archive data. Our near-infrared speckle images with unprecedented diffraction-limited resolution of 55 mas ( ~ 44 AU; H-band) and 76 mas ( ~ 61 AU…
Metal abundances and kinematics of quasar absorbers. I. Absorption systems toward J2233-606
Levshakov, S. A.; Agafonova, I. I.; Centurión, M. +1 more
The metal line profiles of different ions observed in high H I column density systems [N(H I) > 1016 cm-2] in quasar spectra can be used to constrain the ionization structure and kinematic characteristics of the absorbers. For these purposes, a modified Monte Carlo Inversion (MCI) procedure was applied to the study of thre…