A yellow giant, a peculiar A-type dwarf and an interstellar dust cloud unravel the eclipsing binary TYC 4481-358-1

英文摘要：

A first solution for the eclipsing binary TYC 4481-358-1 has been found by combining the results of BVIc-photometry with known stellar models and stellar spectral energy distributions (SEDs). The binary shows total and annular eclipses in a circular 90-days orbit. Masses, radii and effective temperatures have been derived: about 3.01 Msun, 14.29 Rsun and 4950 K for the giant, and about 2.39 Msun, 2.39 Rsun and 9600 K for the dwarf. The peculiar dwarf is discolored and shows a Teff - passband dependence from 9000 K in the Ic to 9800 K in the B band. The giant is in its final stage of core helium burning. The interstellar extinction in our line of sight is considerable (Av about 1.44 mag at an elevated Rv of 3.58).