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Simultaneous Extreme Ultraviolet and Optical Observations of the Magnetic Cataclysmic Variable PQ Geminorum
We present the results of simultaneous optical polarimetry and EUVspectroscopy and photometry of PQ Gem, a magnetic cataclysmic variablewhich shows observational properties of the strongly magnetic AM Herclass, as well as the weaker field DQ Her stars. The EUV spectrum of PQGem is weak, showing continuum blueward of 80 Angstroms and a fewpossible weak emission lines due to Mg, Si, and Ne. The EUV light curvehas a similar appearance to previous X-ray data obtained for PQ Gem,including a narrow "dip" feature that is modulated with the white dwarfspin period. Observed polarization variations on the spin period,modeled by a slightly modified version of that used in Potter et al.,matched the optical light curve and linear polarization curve reasonablywell, but not the position angle variation. The EUV properties of PQ Gemcan also be understood in the context of this model.
| Mesures de vitesses radiales. VIII. Accompagnement AU sol DU programme d'observation DU satellite HIPPARCOS
We publish 1879 radial velocities of stars distributed in 105 fields of4^{\circ} \times 4^{\circ}. We continue the PPO series \cite[(Fehrenbachet al. 1987;]{Feh87} \cite[Duflot et al. 1990, 1992 and 1995),]{Du90}using the Fehrenbach objective prism method. Table 1 only available inelectronic form at CDS via to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
| New optical positions and proper motions of late type stars associated with SiO masers
The 33 cm astrograph of the Bordeaux Observatory has been used to derivewith respect to AGK3 reference stars, accurate positions of late typevariable stars variable stars associated with strong SiO maser emission.It is suggested that selected maser stars can be used to link theHIPPARCOS system and the VLBI extragalactic reference frame. The propermotions of the program (SiO) and reference stars are derived and, forthe program stars, are compared to the McCormick catalog of propermotions.
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