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The Tokyo PMC catalog 90-93: Catalog of positions of 6649 stars observed in 1990 through 1993 with Tokyo photoelectric meridian circle
The sixth annual catalog of the Tokyo Photoelectric Meridian Circle(PMC) is presented for 6649 stars which were observed at least two timesin January 1990 through March 1993. The mean positions of the starsobserved are given in the catalog at the corresponding mean epochs ofobservations of individual stars. The coordinates of the catalog arebased on the FK5 system, and referred to the equinox and equator ofJ2000.0. The mean local deviations of the observed positions from theFK5 catalog positions are constructed for the basic FK5 stars to comparewith those of the Tokyo PMC Catalog 89 and preliminary Hipparcos resultsof H30.
| IUE and ground-based observations of mass-loss in the Magellanic Clouds
Ground based and IUE observations of hot stars in the large and smallMagellanic Clouds were carried out to investigate the mass loss processin these objects and to search for differences with galactic hot stars.Preliminary results show that in a large proportion of the starsobserved the mass loss process is taking place. A mechanism foracceleration of the wind in OB stars is proposed.
| Coordinated ground-based and International Ultraviolet Explorer (IUE) observations of hot stars in the Magellanic Clouds
Ground based and International Ultraviolet Explorer (IUE) observationsof hot stars in the Large and Small Magellanic Clouds were carried outto investigate the mass loss process in these objects and to search fordifferences with galactic hot stars. Results show that in a largeproportion of the stars observed the mass loss process is taking place.A mechanism for acceleration of the wind in OB stars is proposed,involving multiple scattering of hard UB photons in the range 100A to500A.
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