Abstract
We measured the radial velocity of the star θ 1 Ori D from IUE spectra and used published observations. Based on these data, we determined the period of its radial-velocity variations, P=20.2675±0.0010 days, constructed the phase radial-velocity curve, and solved it by least squares. The spectroscopic orbital elements were found to be the following: the epoch of periastron passage Ep=JD 2430826.6±0.1, the system's center-of-mass velocity /Gg=32.4±1.0 km s−1, K=14.3±1.5 km s−1, Ω=3.3±0.1 rad, e=0.68±0.09, a 1 sin i = 3 × 1010 km, and f 1 = 0.0025M ⊙. Twice the period, P=40.528±0.002 days, is also consistent with the observations.
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Translated from Pis'ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Zhurnal, Vol. 28, No. 12, 2002, pp. 936–939.
Original Russian Text Copyright © 2002 by Vitrichenko.
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Vitrichenko, É.A. A preliminary radial-velocity curve for the star θ 1 Ori D. Astron. Lett. 28, 843–846 (2002). https://doi.org/10.1134/1.1525835
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DOI: https://doi.org/10.1134/1.1525835