HD 38422

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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.

FUOR observations III. FU Orionis during 1984-1990. A remarkable change in the brightness decrease rate.
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Gözlemler ve gökölçümü verileri

Takýmyýldýz:	Avci
Sað Açýklýk:	05^h46^m06.22^s
Yükselim:	+10Â°06'07.2"
Görünürdeki Parlaklýk:	8.976
Uzaklýk:	10000000 parsek
özdevim Sað Açýklýk:	-1.6
özdevim Yükselim:	-2.9
B-T magnitude:	9.021
V-T magnitude:	8.98

Kataloglar ve belirtme:

Özgün isimleri
HD 1989	HD 38422
TYCHO-2 2000	TYC 719-314-1
USNO-A2.0	USNO-A2 0975-01984941
HIP	HIP 27217

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