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Multiplicity among peculiar A stars. I. The AP stars HD 8441 and HD 137909, and the AM stars HD 43478 and HD 96391
We present the first results of a radial-velocity survey of cool Ap andAm stars. HD 8441 is not only a double system with P = 106.357 days, butis a triple one, the third companion having an orbital period largerthan 5000 days. Improved orbital elements are given for the classical Apstar HD 137909 = beta CrB by combining our radial velocities withpublished ones. We yield new orbital elements of the two Am, SB2binaries HD 43478 and HD 96391. Good estimates of the individual massesof the components of HD 43478 can be given thanks to the eclipses ofthis system, for which an approximate photometric solution is alsoproposed. Based on observations made at the Observatoire de HauteProvence (CNRS), France, at the Jungfraujoch station of Observatoire deGeneve, Switzerland, and on data from the ESA Hipparcos satellite.Tables 6 to 12 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
| 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.
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Observation and Astrometry data
| Constellation: | Ursa Major |
| Right ascension: | 10h51m27.79s |
| Declination: | +42°15'01.8" |
| Apparent magnitude: | 8.797 |
| Distance: | 1298.701 parsecs |
| Proper motion RA: | 10.4 |
| Proper motion Dec: | -37.5 |
| B-T magnitude: | 10.109 |
| V-T magnitude: | 8.906 |
Catalogs and designations:
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