Spectroscopic and photometric observations of the eclipsing star UV Leo |
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| Authors: | D P Kjurkchieva D V Marchev |
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| Institution: | Department of Physics, Shumen University, 9700 Shumen, Bulgaria |
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| Abstract: | High-resolution spectroscopic observations around the Hα line and BVRI photometry of the eclipsing short-period RS CVn star UV Leo are presented. The simultaneous light-curve solution and radial velocity-curve solution led to the following values of the global parameters of the binary: temperatures T 1= 6000 ± 100 K and T 2= 5970 ± 20 K ; masses M 1= 0.976 ± 0.067 M⊙ and M 2= 0.931 ± 0.052 M⊙ ; separation a = 3.716 ± 0.048 R⊙ ; orbital inclination  ; radii R 1= 1.115 ± 0.052 R⊙ and R 2= 1.078 ± 0.051 R⊙ ; equatorial velocities V 1= 98.8 ± 2.3 km s−1 and V 2= 89.6 ± 2.7 km s−1 . These results lead to the conclusion that the two components of UV Leo are slightly oversized for their masses and lie within the main-sequence band on the mass–radius diagram, close to the isochrone 9 × 1010 yr. |
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| Keywords: | stars: activity binaries: spectroscopic stars: chromospheres stars: fundamental parameters stars: individual: UV Leo |
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