Spectral Classification of Stars in A Supplement to the Bright Star Catalogue
MK spectral types are given for about 584 stars in A Supplement to theBright Star Catalogue. These are compared with Hipparcos parallaxes tocheck the reliability of those classifications. The estimated errors are+/-1.2 subtypes, and 10% of the luminosity classes may be wrong.
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No Supermassive Black Hole in M33?
We observed the nucleus of M33, the third-brightest galaxy in the LocalGroup, with the Space Telescope Imaging Spectrograph at a resolution atleast a factor of 10 higher than previously obtained. Rather than thesteep rise expected within the radius of gravitational influence of asupermassive black hole, the random stellar velocities showed a decreasewithin a parsec of the center of the galaxy. The implied upper limit onthe mass of the central black hole is only 3000 solar masses, aboutthree orders of magnitude lower than the dynamically inferred mass ofany other supermassive black hole. Detecting black holes of only a fewthousand solar masses is observationally challenging, but it is criticalto establish how supermassive black holes relate to their host galaxies,and which mechanisms influence the formation and evolution of both.
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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
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Photometry of Stars in the Field of Nova Cassiopeiae 1993
Not Available
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Photometry of Stars in the Field of the Dwarf Nova KU Cassiopeiae
Not Available
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Photometry of Stars in the Field of WZ Cassiopeiae
Not Available
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Photometry of Stars in the Field of the Mira V418 Cassiopeiae
Not Available
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UBVRI photometry of stars useful for checking equipment orientation stability
Several sets of stars have been measured, equally spaced around the skyin right ascension, over a range in declination from -75 deg to +30 deg.The goal was to obtain a number of well-observed stars with qualityinternally consistent magnitudes and color indices. The stars wereneeded to check orientation effects of photometric equipment.
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