The W Ursae Majoris system ER Ori: A multiple star

Details The W Ursae Majoris system ER Ori: A multiple star The W Ursae Majoris system ER Ori: A multiple star

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289..827g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 3, p. 827-836

Astronomy and Astrophysics

Astrophysics

14

F Stars, Power Spectra, Speckle Interferometry, Stellar Spectrophotometry, Triple Stars, Visible Spectrum, Cross Correlation, Image Analysis, Light Curve, Radial Velocity, Spectrum Analysis

Scientific paper

308 photoelectric and 29 spectroscopic observations of the W-type W UMa system ER Ori are presented and analyzed. A cross-correlation method was used to determine the radial velocity curves. The existence of a third body was established by its presence in the cross-correlation function. High-resolution speckle masking observations show that this companion has a separation of 0.19 arcsec from the W UMa system, is about 2.3 magnitudes fainter than the binary at maximum light, and is very likely physically connected to the system. The (O-C)-diagram of minimum times was re-analyzed. The light time effect caused by the third body has only a marginal influence, indicating that its orbital plane has an inclination close to 0 deg. The presence of the companion was taken into account inthe synthetic light and radial velocity curve study. This combined solution yields a mass ratio of q = 0.64 +/- 0.08. The derived masses and radii indicate that ER Ori is a slightly evolved W UMa system.

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