Multisite continuous spectroscopy. 3: Photometric analysis and SPOT modelling of the light curves of HR 1099 before and after the 1989 optical flares

Details Multisite continuous spectroscopy. 3: Photometric analysis and SPOT modelling of the light curves of HR 1099 before and after the 1989 optical flares Multisite continuous spectroscopy. 3: Photometric analysis and SPOT modelling of the light curves of HR 1099 before and after the 1989 optical flares

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..168z&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 1, p. 168-178

Astronomy and Astrophysics

Astrophysics

16

Binary Stars, Light Curve, Starspots, Stellar Flares, Stellar Models, Stellar Spectrophotometry, Light (Visible Radiation), Mathematical Models, Visible Spectrum

Scientific paper

We present the UBV and UBV (RI)c photometry of HR 1099 (= V711 Tau) carried out at the Beijing Astronomical Observatory and the European Southern Observatory (ESO) (La Silla, Chile) during the second Multisite Continuous Spectroscopy (MUSICOS) campaign in 1989. Except for the zeropoint, the light curves at both observatories coincide with each other and are combined to form unified light curves. A photometric analysis is carried out by using the spot approximation based on the Roche model. The light curves are obviously asymmetric and show an unusual phase shift of light minimum which is different in different wave bands. It is found that two cool and one hot spots can reconstruct simultaneously the main characteristics of all 5 UBV (RI)c light curves and that two adjacent spots, one cool and the other hot, created a large temperature gradient distribution along the longitude which is responsible for the phase shift in different wave bands. The increase of the brightness of the binary system observed immediately after the flare appeared to be phase-dependent and it is found to be probably caused by the evolution of spots, especially by the hot spot.

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