Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007smma.conf..271s&link_type=abstract
Spectroscopic methods in modern astrophysics. Proceedings of the conference held 13-15 September 2006, Moscow, Russia. Eds. L. M
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
Objects of research are four brightest stars of the Trapezium in Orion: Θ^1 Ori A, Θ^1 Ori B, Θ^1 Ori C, Θ^1 Ori D. All stars of the Trapezium are, apparently, multiple systems as show changes of radial velocities and infra-red excess. However, there is open a question on the number of stars in each system and the periods of radial velocities changes. High resolution ( R=40000 ) Echelle-spectra for all four stars of the Trapezium in the spectral range of 4000--8700 Å have been obtained on the 1.5-m Russian-Turkish telescope (RTT150) in January and March,2006 Radial velocities of all stars of the Trapezium are measured. For a star Θ^1 Ori A radial velocities are correspond with published radial velocities curve within the error of determinations (±1 km/s). The presence of the third component for a star Θ^1 Ori B is confirmed. For a star Θ^1 Ori there is a considerable deviation from the published radial velocities curve ((O-C)˜10 km/s). For a star Θ^1 Ori D is shown that more reliable period is 20.3 days as compared with the period of 40.6 days.
Bikmaev I. F.
Stetsenko D. V.
Vitrichenko Eh. A.
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