Kinematics of Hipparcos Visual Binaries. II. Stars with Ground-Based Orbital Solutions
This paper continues kinematical investigations of the Hipparcos visualbinaries with known orbits. A sample, consisting of 804 binary systemswith orbital elements determined from ground-based observations, isselected. The mean relative error of their parallaxes is about 12% andthe mean relative error of proper motions is about 4%. However, even 41%of the sample stars lack radial velocity measurements. The computedGalactic velocity components and other kinematical parameters are usedto divide the stars with known radial velocities into kinematical agegroups. The majority (92%) of binaries from the sample are thin diskstars, 7.6% have thick disk kinematics and only two binaries have halokinematics. Among them, the long-period variable Mira Ceti has a verydiscordant {Hipparcos} and ground-based parallax values. From the wholesample, 60 stars are ascribed to the thick disk and halo population.There is an urgent need to increase the number of the identified halobinaries with known orbits and substantially improve the situation withradial velocity data for stars with known orbits.
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Two-colour photometry for 9473 components of close Hipparcos double and multiple stars
Using observations obtained with the Tycho instrument of the ESAHipparcos satellite, a two-colour photometry is produced for componentsof more than 7 000 Hipparcos double and multiple stars with angularseparations 0.1 to 2.5 arcsec. We publish 9473 components of 5173systems with separations above 0.3 arcsec. The majority of them did nothave Tycho photometry in the Hipparcos catalogue. The magnitudes arederived in the Tycho B_T and V_T passbands, similar to the Johnsonpassbands. Photometrically resolved components of the binaries withstatistically significant trigonometric parallaxes can be put on an HRdiagram, the majority of them for the first time. Based on observationsmade with the ESA Hipparcos satellite.
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Photographic astrometry of binary and proper-motion stars
Plate series obtained at the 61-cm Sproul refractor of SwarthmoreCollege were processed during the time October 1982 to December 1983.Parts of some plate series had been measured previously. The presentinvestigation involves an evaluation of the entire material, taking intoaccount 58 trigonometric parallaxes and 14 binary-star mass ratios.Table I lists the parallax results. The measured components of theannual motion are to three decimals of arc seconds. A summary of themass-ratio results is provided in a second table. All observed objectsare briefly discussed.
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Some enigmatic binary stars. I
Historical measurements of components of binary star systems at timesexhibit evidence for incompatible interpretations. A short period andstrong eccentricity can equally be a long period with feebleeccentricity. Furthermore, measurements have been made indicating bothdirect and retrograde motions of the components. It has sometimes beenfound that the observations of contradicting evidence have been made ofa second binary system near the system first measured. Note is taken ofthe objects ADS 1959 - A 1818, ADS 2051 - HU 539, ADS 5515 - A 512, ADS5671 - BU 1022, ADS 6001 - A 1963, and ADS 7550 - A 2561, which maypossibly be combinations of two or even three binary clusters observedat different times. Tables are presented of data thus far measured ofeach system.
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Visual double stars measured at Lick Observatory Mount Hamilton, California.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1979PASP...91..479H&db_key=AST
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Micrometer observations of double stars.8.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1975ApJS...29..315H&db_key=AST
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Mesures d'étoiles doubles faites à l'équatorial de 38 CM de l'Observatoire de Paris
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972A&AS....6..147B&db_key=AST
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Mesures d'étoiles doubles faites au 0,38 m de l'Observatoire de Paris.
Not Available
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Measures of 313 doubles stars.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1963AJ.....68..114W&db_key=AST
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Mesures d'étoiles doubles effectuées au réfracteur de 38 cm de l' Observatoire de Nice
Not Available
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Mesures d'Etoiles Doubles faites à l'Observatoire de Paris
Not Available
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