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Photographic observations of visual double stars.
Jasinta, D. M. D.; Raharto, M.; Soegiartini, E.
We present the results of photographic observations of 399 visual double stars of the Hipparcos Input Catalogue (HIC), observed in the years 1980 and 1990-1991 with the 60-cm double-refractor of the Bosscha Observatory at Lembang, Java.
IUE Echelle Observations of the Photospheres and Circumstellar Environments of Hot White Dwarfs
Holberg, J. B.
Hubble Space Telescope Imaging of the Wind-blown Lobe NGC 6165
O'Neil, Earl J., Jr.; Scowen, Paul; Lynds, C. Roger +3 more
We have used the Hubble Space Telescope wide field/planetary camera to study the structure of the bipolar nebular NGC 6164/6165. Our study concentrates on the structure of a number of small clumps of material embedded within the southern lobe of the system (NGC 6165). These knots have a cometary appearance, with bright surfaces facing the central …
Nucleon Modulation from the ULYSSES Rapid Latitude Scan: COSPIN/KET Results
Sierks, H.; Kunow, H.; Wibberenz, G. +11 more
The Secondary Star in AM CVn
Solheim, J. -E.; Nymark, T. K.
The spectrum of AM CVn shows no definite sign of a secondary star, but through black body calculations of the spectra of the primary, disc and secondary objects, we find that if a one-temperature model for the secondary is assumed, a secondary which is cooler than 5000 K may be present without being seen in the spectrum. There is some excess flux …
Exposed white dwarfs in dwarf novae
Sion, Edward M.
Hubble Space Telescope far ultraviolet spectroscopic observations of cataclysmic variable white dwarfs, exposed during dwarf nova quiescence, have yielded a number of new insights on accretional heating, photospheric abundances of the accreted atmosphere and rotational velocities of the underlying degenerates. Recent results of synthetic spectral …
Spectroscopy of B Stars in the Small and Large Magellanic Clouds
Rolleston, W. R. J.
High-resolution spectroscopic observations of B-type stars in the Small (SMC) and Large (LMC) Magellanic Clouds have been obtained using the UCL echelle spectrograph at the Anglo-Australian Telescope. Preliminary results of an LTE model-atmosphere analysis are presented for three stars in the LMC, together with the results of a similar analysis of…
Interstellar Ultraviolet Extinction Towards the Nitrogen Sequence Wolf-Rayet Stars
Niedzielski, Andrzej
With the archive IUE spectra of WR stars collected by Niedzielski and Rochowicz (1994) we obtain the UV extinction curve for WN stars. Using the two-color diagram method we can reach the goal almost independently, assuming only similar (b-v)_0 for all single galactic WN stars, what is discussed on the basis of latest results. The resulting extinct…
Simultaneous UV, optical and radio monitoring of the BL Lac object OJ 287 in March 1993
Maraschi, L.; Pian, E.; Quirrenbach, A. +26 more
The BL Lacertae object OJ 287 was intensively monitored with the IUE satellite from 1993 March 15 to 20 in the 2000-3000 Angstroms wavelength region. The very low emission state of the source hampered the detection during part of the 23 performed exposures. The light curve at 2650 Angstroms constructed with the 11 best images exhibits a variable t…
The induced magnetosphere of comet Halley 3. The plasma kinematics
Neubauer, F. M.; Israelevich, P. L.; Ershkovich, A. I.
The plasma velocity in the magnetosphere of comet Halley is calculated by using the displacement of magnetic field lines during the Giotto flyby. The obtained profile is in good agreement with that found from the momentum balance condition. The radial component of plasma velocity measured in situ (Schwenn et al., 1987) correlates well with the spa…