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Observations of fuors. FU Orionis during 1984-1990 - Notable variation in the brightness decline rate
Results of FU Ori photometry on Mt. Maidanak during 1984-1990 areanalyzed. In December 1987, the fuor exhibited a stepwise decrease inbrightness by 0.1 mag, after which the decrease rate of FU Oribrightness grew threefold (0.07 mag/yr compared to 0.02 mag/yr during1961-1980), while the U-B color parameter decreased to +0.82 mag. Adistance modulus of 8.1 +/- 0.2 mag is confirmed on the basis ofphotometry of 65 stars in the neighborhood of FU Ori. UBVR magnitudes ofvariable and emission-line stars in the FU Ori field are also presented;brightness variations are suspected for seven stars.
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| Takýmyýldýz: | Avci |
| Sað Açýklýk: | 05h48m39.49s |
| Yükselim: | +10°07'39.4" |
| Görünürdeki Parlaklýk: | 10.359 |
| özdevim Sað Açýklýk: | 5.5 |
| özdevim Yükselim: | -7.1 |
| B-T magnitude: | 10.822 |
| V-T magnitude: | 10.398 |
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