UV Leo: The Binary with the Two Suns

Djurašević, G.; Rovithis, P.; Rovithis‐Livaniou, H.; Fragoulopoulou, E.

doi:10.1007/s10509-005-4840-1

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…Frederik & Etzel (1996) classified the light curves of UV Leo into six types according to the depth of the secondary eclipse and the asymmetry of brightness outside eclipses. They assumed that the light‐curve distortions of UV Leo had a similar cause to those of RS CVn stars (because of the short orbital period), and reproduced light‐curve asymmetries by assuming the presence of large (up to angular radius 55°) dark spots (Frederik & Etzel 1996; Djurasevic et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic and photometric observations of the eclipsing star UV Leo

Kjurkchieva

Marchev

2007

Monthly Notices of the Royal Astronomical Society

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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 i = 84. • 2 ± 0. • 2; 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 × 10 10 yr.

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Section: Introductionmentioning

confidence: 99%

Spectroscopic and photometric observations of the eclipsing star UV Leo

Kjurkchieva

Marchev

2007

Monthly Notices of the Royal Astronomical Society

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Cyclic light and period variations of the UV Leonis system

Manzoori

2012

Astron Nachr

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Solutions of the new standard V -light curves for the EA type binary UV Leo are obtained using the PHOEBE code (0.31a version). Absolute parameters of the stellar components were then determined, enabling them to be positioned on the absolute magnitude-color (l.e. MV vs. B − V ) isochrones diagram, based on which the age of the system is estimated to be > 4×10 9 yr. Also times of minima data ("O − C curve") have been analyzed. Apart from an almost sinusoidal variation with a period of 29.63 yr, which modulates the orbital period, and was attributed to a third body orbiting around the system, other cyclic variation in the orbital period and also brightness, with time scales of 24.25 and 22.77 yr were found, respectively. We associate this with a magnetic activity cycle newly reported here for UV Leo.

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UV Leo: The Binary with the Two Suns

Cited by 2 publications

References 9 publications

Spectroscopic and photometric observations of the eclipsing star UV Leo

Spectroscopic and photometric observations of the eclipsing star UV Leo

Cyclic light and period variations of the UV Leonis system

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