ABSOLUTE DIMENSIONS OF THE METALLIC-LINE ECLIPSING BINARY V501 MONOCEROTIS

作者：Torres Guillermo; Lacy Claud H Sandberg; Pavlovski Kresimir; Fekel Francis C; Muterspaugh Matthew W

来源：Astronomical Journal, 2015, 150(5): 154.

DOI：10.1088/0004-6256/150/5/154

• binaries: eclipsing
• stars: evolution
• stars: fundamental parameters
• stars: individual (V501 Mon)
• techniques: photometric
• techniques: spectroscopic

We report extensive high-resolution spectroscopic observations and V-band differential photometry of the slightly eccentric 7.02 day detached eclipsing binary V501 Mon (A6m+ F0), which we use to determine its absolute dimensions to high precision (0.3% for the masses and 1.8% for the radii, or better). The absolute masses, radii, and temperatures are M-A = 1.6455 +/- 0.0043M(circle dot), R-A = 1.888 +/- 0.029 R-circle dot, and T-eff(A) = 7510 +/- 100 K for the primary and M-B = 1.4588 +/- 0.0025M(circle dot), R-B = 1.592 +/- 0.028 R-circle dot, and T-eff(B) = 7000 +/- 90 K for the secondary. Apsidal motion has been detected, to which General Relativity contributes approximately 70%. The primary star is found to be a metallic-line A star. A detailed chemical analysis of the disentangled spectra yields abundances for more than a dozen elements in each star. Based on the secondary, the system metallicity is near solar: [Fe/H] = + 0.01 +/- 0.06. Lithium is detected in the secondary but not in the primary. A comparison with current stellar evolution models shows a good match to the measured properties at an age of about 1.1 Gyr.

• 出版日期2015-11