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Contribution to the search for binaries among Am stars - V. Orbital elements of eight short-period spectroscopic binaries
We present the results of a radial-velocity study of eight Am stars (HD341, 55822, 61250, 67317, 93991, 162950, 224890 and 225137) observed atObservatoire de Haute-Provence with the CORAVEL instrument. We find thatthese systems are single-line spectroscopic binaries whose orbitalelements are determined for the first time.
| UV survey of certain fields of the sky with the Glazar space telescope
The Glazar telescope, installed on the Kvant module of the Mir spacestation, started regular observations in August 1987. This paperpresents results of the photometry of 15 stars detected by the Glazartelescope at 1640 A in an area of about 28 sq deg at high Galacticlongitudes.
| Spectroscopic tests of photoelectric stellar classification of abnormal stars
Spectroscopic classification is obtained for 169 northern A5-G0 starspredicted by Olsen (1979, 1980) to have abnormal spectra on the basis ofStromgren four-color photometry. The success in identifying reddenedearly type stars was nearly 100 percent, for Am and early type weaklined stars about 75 percent, for stars above main sequence about 50percent, for composite spectra about 25 percent, and for Ap and LambdaBoo stars 0 percent. Thus photoelectric photometry is a successful firststep in discovering stars of the more extreme spectroscopicabnormalities.
| Estimation of spectral classifications for bright northern stars with interesting Stromgren indices
The purpose of this investigation is to provide spectroscopic observerswith finding lists of potentially interesting objects. From anunpublished UVBY catalogue of 7026 northern stars (mostly brighter than8.3m) 1094 objects with interesting combinations of UVBY indices havebeen selected. Most stars with post-HD classifications have beenexcluded, as well as late F dwarfs belonging to the intermediatepopulation II. For the 792 remaining stars estimated spectralclassifications are given. The techniques and experience from a previouspaper dealing with southern stars have been utilized here. Among thepredicted spectral classifications are 40 OB stars; 262 Ap, Am, or Fmstars; 16 supergiants of types A to G; 110 bright giants of types A to K(class II); 156 double stars or objects with composite spectra; 26 lateF dwarfs; 91 weak-lined dwarf and giant stars of types F to K, includingearly F-type population II field blue stragglers; and a few possiblefield horizontal branch stars, lambda Bootis-type stars, and late-typehalo giants.
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