Observations of fuors. FU Orionis during 1984-1990 - Notable variation in the brightness decline rate

Details Observations of fuors. FU Orionis during 1984-1990 - Notable variation in the brightness decline rate Observations of fuors. FU Orionis during 1984-1990 - Notable variation in the brightness decline rate

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993azh....70..339i&link_type=abstract

Astronomicheskij Zhurnal (ISSN 0004-6299), vol. 70, no. 2, p. 339-349.

Astronomy and Astrophysics

Astronomy

1

Brightness Distribution, Emission Spectra, Light Curve, Protostars, Stellar Spectra, Variable Stars, Stellar Spectrophotometry, Ubv Spectra

Scientific paper

Results of FU Ori photometry on Mt. Maidanak during 1984-1990 are analyzed. In December 1987, the fuor exhibited a stepwise decrease in brightness by 0.1 mag, after which the decrease rate of FU Ori brightness grew threefold (0.07 mag/yr compared to 0.02 mag/yr during 1961-1980), while the U-B color parameter decreased to +0.82 mag. A distance modulus of 8.1 +/- 0.2 mag is confirmed on the basis of photometry of 65 stars in the neighborhood of FU Ori. UBVR magnitudes of variable and emission-line stars in the FU Ori field are also presented; brightness variations are suspected for seven stars.

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