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Ultraviolet and optical studies of binaries with luminous cool primaries and hot companions. II - BVRI observations
Johnson system BVRI measurements are presented for 117 stars, most ofthem with no previous R and I photometry and many with no previous B andV. The prime objects for measurement are unresolved or nearly unresolvedbinaries containing a late-type giant or supergiant and an early-typecompanion. Other objects on the program include suspected binaries andother F-G giants and supergiants lacking at least R and I magnitudes.The variable F and G supergiants 1 Mon, 89 Her, HR 7308, HR 8157, HR8752, and rho-Cas and the eclipsing systems W Ser and ST Aqr wereobserved; HR 8752 showed significant dimming and cooling over 125 days.Several of Halliwell's (1979) candidates for nearby stars were measured.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Avci |
| Sað Açýklýk: | 05h51m27.08s |
| Yükselim: | +10°15'08.9" |
| Görünürdeki Parlaklýk: | 8.824 |
| Uzaklýk: | 234.742 parsek |
| özdevim Sað Açýklýk: | -4.9 |
| özdevim Yükselim: | -7.2 |
| B-T magnitude: | 8.866 |
| V-T magnitude: | 8.828 |
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