Abstract
Published photoelectric measurements over a wide wavelength range (0.36–18 µm) are used to study the continuum spectrum of the star Θ1 Ori C. The model that assumes the following three radiation sources is consistent with observations: (1) a zero-age main-sequence O7 star (object 1) of mass M 1=20M ⊙, radius R 1=7.4R ⊙, effective temperature T 2=37 000 K, and absolute bolometric magnitude \(M\mathop {bol}\limits^1 = - 7\mathop .\limits^m 7\); (2) object 2 with M 2=15M ⊙, R 2=16.2R ⊙, T 2=4000 K, and \(M\mathop {bol}\limits^2 = - 5\mathop .\limits^m 1\); and (3) object 3 with R 310 700 R ⊙, T 3=190 K, and \(M\mathop {bol}\limits^3 = - 0\mathop .\limits^m 6\). The visual absorption toward the system is \(A_V = 0\mathop .\limits^m 95\) and obeys a normal law. The nature of objects 2 and 3 has not been elucidated. It can only be assumed that object 2 is a companion of the primary star, its spectral type is K7, and it is in the stage of gravitational contraction. Object 3 can be a cocoon star and a member of the system, but can also be a dust envelope surrounding the system as a whole.
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Translated from Pis'ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 26, No. 4, 2000, pp. 294–300.
Original Russian Text Copyright © 2000 by Vitrichenko.
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Vitrichenko, E.A. Continuum spectrum of the star Θ1 Ori C. Astron. Lett. 26, 244–249 (2000). https://doi.org/10.1134/1.20388
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DOI: https://doi.org/10.1134/1.20388