Orionis A - A pre-main sequence low Q binary system?

Details Orionis A - A pre-main sequence low Q binary system? Orionis A - A pre-main sequence low Q binary system?

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...222..117b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 222, no. 1-2, Sept. 1989, p. 117-120.

Astronomy and Astrophysics

Astrophysics

24

Binary Stars, Light Curve, Orion Constellation, Pre-Main Sequence Stars, Star Formation, Orbital Elements, Stellar Mass, Stellar Spectra

Scientific paper

The well-known light curve of Theta1 Orionis A, combined with the spectroscopic orbit based on the present measurements, suggests for the radius of the primary star a value clearly lower than expected. A spectral reclassification (B3 III-IV) allowed by the present data cannot resolve this discrepancy. Dynamic and evolutionary considerations indicate that this could be a pre-main sequence binary system. Therefore, the low mass ratio (q of above 0.32) resulting from the present orbital elements can be considered as an unevolved value and may be an interesting datum in the context of formation models.

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