Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001astl...27..379z&link_type=abstract
Astronomy Letters, vol. 27, p. 379-385 (2001)
Astronomy and Astrophysics
Astronomy
1
Variable And Peculiar Stars
Scientific paper
Photoelectric (UBVR) observations of the eclipsing variable EQ Ori are presented. The ephemerides of primary minima are refined, and the range of the star's light variations is determined. All light curves are solved by Lavrov's direct method, and highly accurate photometric orbital elements are obtained for the system. The magnitudes and colors of each component are calculated and analyzed in two-color (U-B)-(B-V) and (U-B)-(V-R) diagrams. The system's primary component is classified as a metallic-line Am star. The absolute parameters of the components are estimated, and the binary is classified as a detached system with a subgiant: A0 V and K2 IV. EQ Ori has a faint physical companion, which causes the epochs of primary minimum to be systematically displaced with a period of about 30 years. The expected parameters of the distant companion are estimated. The system's components are at a pre-ZAMS evolutionary stage, with their age being 2 x 10^6 years. EQ Ori is thought to be a member of the Ori I association.
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