Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26as...87...89g&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 87, no. 1, Jan. 1991, p. 89-95.
Astronomy and Astrophysics
Astrophysics
9
Chromosphere, Infrared Photometry, Light Curve, Stellar Flares, Stellar Spectrophotometry, T Tauri Stars, Color-Magnitude Diagram, Emission Spectra, Main Sequence Stars, Stellar Luminosity, Stellar Motions, Stellar Rotation
Scientific paper
Two simultaneous optical and IR photometric observation runs of RU Lupi were carried out at the ESO in February 1983 and in June 1986 within the framework of a large multifrequency coordinated campaign of observations. RU Lupi was found in two different states. In the first case the star was in 'quiescence', in the second it was brighter and showed larger variations due to flare like event (FLE). A positive correlation between luminosity and its variations has been found. A Fourier analysis of the light curve available in literature was performed to point out the rotational period. The analysis of these data excludes any periodicity. The color-color diagnostic diagram clearly shows that RU Lupi variability is mainly due to a strong photospheric and chromospheric activity.
Errico L.
Giovannelli Franco
Rossi Claudio
Vittone A. A.
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