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UBV absolute CCD photometry and differential astrometry of close visual double stars, with G-type primaries
We present V magnitudes, (B-V) and (U-B) colours of close visual doublestar components, and their differences as well as separations andposition angles of 40 visual double stars. The common properties of themembers of this sample are the small angular separation rho, which isless than 7'', and the common spectral type of the primaries, which areof G-type. The observations made with the Bessel U, B and V filters,while the astrometry was performed in the V filter only. For theobservations, the CCD camera attached to the Cassegrain focus of the 90cm Dutch telescope, at La Silla, Chile, had been used. From the analysisof the data we concluded that from the sample of the fourty double starsobserved seven proved to be physical pairs, while the rest must havecommon origin components. Based on observations made at ESO La Silla,Chile. Tables 1 and 2 are only available in electronic form at the CDSvia anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
| Photographic observations of visual double stars.
We present the results of photographic observations of 399 visual doublestars of the Hipparcos Input Catalogue (HIC), observed in the years 1980and 1990-1991 with the 60-cm double-refractor of the Bosscha Observatoryat Lembang, Java.
| UVBY observations of A, F, G and K field stars
Photoelectric data in the uvby system have been obtained for about 800southern stars of the Hipparcos Input Catalog (Grenon, 1982, 1985). Mostof the stars are F and G main sequence and fall in the magnitude range V= 8-11.
| On the relationship between the apparent magnitudes given in several catalogues and the UBV system.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1974A&AS...15..215O&db_key=AST
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Yilanci |
| Sað Açýklýk: | 16h46m14.86s |
| Yükselim: | -17°20'48.1" |
| Görünürdeki Parlaklýk: | 9.606 |
| Uzaklýk: | 101.937 parsek |
| özdevim Sað Açýklýk: | 0 |
| özdevim Yükselim: | 0 |
| B-T magnitude: | 10.29 |
| V-T magnitude: | 9.663 |
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