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VRI photometry of wide double stars with A- type primaries.
We are presenting VRI photometry of 93 wide visual double stars havinglate B- or A- type primaries, taken from the Annex of Double andMultiple Stars of the HIPPARCOS Input Catalogue. Spectral types havebeen estimated for most of the primaries and for the majority of thesecondaries. 40% of them probably have common origin components, forwhich we calculated photometric parallaxes and some orbital valuesestimates.
| Visual measurements of southern double stars. II
A group of 248 micrometric observations of 104 double stars arepresented, forming the second series of a program carried out at Cordobawith a 30 cm refractor. Usually neglected IDS pair south of -60 deg areselected for observation, most of them having been measured only one ortwo times previously. The measurements are compared with all the earlierobservations to derive estimates for the personal equation in P.A. andseparation, and the nature of many pairs is discussed by making use ofcatalog proper motions.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Pergel |
| Sað Açýklýk: | 13h54m37.50s |
| Yükselim: | -66°54'04.1" |
| Görünürdeki Parlaklýk: | 7.82 |
| Uzaklýk: | 235.849 parsek |
| özdevim Sað Açýklýk: | -12.2 |
| özdevim Yükselim: | -14.4 |
| B-T magnitude: | 7.907 |
| V-T magnitude: | 7.828 |
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