Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007mnras.381..663k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 381, Issue 2, pp. 663-668.
Astronomy and Astrophysics
Astronomy
8
Stars: Activity, Binaries: Spectroscopic, Stars: Chromospheres, Stars: Fundamental Parameters, Stars: Individual: Uv Leo
Scientific paper
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 T1 = 6000 +/- 100 K and T2 = 5970 +/- 20 K; masses M1 = 0.976 +/- 0.067Msolar and M2 = 0.931 +/- 0.052Msolar separation a = 3.716 +/- 0.048Rsolar orbital inclination ; radii R1 = 1.115 +/- 0.052Rsolar and R2 = 1.078 +/- 0.051Rsolar equatorial velocities V1 = 98.8 +/- 2.3kms-1 and V2 = 89.6 +/- 2.7kms-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 × 1010yr.
Kjurkchieva Diana P.
Marchev Dragomir V.
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