Refinement of third body parameters and new photometric results for the early-type multiple system IU Aurigae

Details Refinement of third body parameters and new photometric results for the early-type multiple system IU Aurigae Refinement of third body parameters and new photometric results for the early-type multiple system IU Aurigae

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...403..675o&link_type=abstract

Astronomy and Astrophysics, v.403, p.675-681 (2003)

Astronomy and Astrophysics

Astrophysics

5

Binaries: Eclipsing, Stars: Early-Type, Stars: Individual: Iu Aurigae

Scientific paper

The massive eclipsing binary system IU Aurigae is re-analyzed in the context of new photometric observations and an improved treatment of its long-term period changes (O-C diagram) derived from new times of minima. The best-fit of the O-C curve reveals that the third component is orbiting around the system with a period of 293.3 days in a highly eccentric orbit (e = 0.62). A solution of the most recent UBV light curves obtained during 1997/1998 showed a third light contribution of ~23% and continuation of the orbital plane precession of IU Aurigae. Since the revised mass of the third component deduced from the analysis of the O-C curve of m3=14.2 Msun would imply a larger fraction of third light than suggested by the value of 23% derived from the light curve analysis, the third body is possibly composed of two components. A q-search test applied to the UBV light curves yields a minimum chi 2 value at q=0.67 +/- 0.02, which confirms previous photometric and spectroscopic solutions.
Based on the first observational data of a new optical observatory in Turkey, Çanakkale Onsekiz Mart University Observatory, operated by the Çanakkale Astrophysics Research Center (ÇAAM), URL: http://physics.comu.edu.tr/caam.html

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