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• W3100443284 endingPage "953" @default.
• W3100443284 startingPage "942" @default.
• W3100443284 abstract "θ1 Ori E is a young, moderate mass binary system, a rarely observed case of spectral-type G-giants of about 3 solar masses, which are still collapsing toward the main sequence, where they presumably become X-ray faint. We have obtained high-resolution X-ray spectra with Chandra and find that the system is very active and similar to coronal sources, having emission typical of magnetically confined plasma. It has a broad temperature distribution with a hot component and significant high energy continuum; narrow emission lines from H- and He-like ions, as well as a range of Fe ions, and relative luminosity, Lx/Lbol = 10−3, at the saturation limit. Density, while poorly constrained, is consistent with the low density limits, our upper limits being ne < 1013 cm-3 for Mg xi and ne < 1012 cm-3 for Ne ix. Coronal elemental abundances are sub-solar, with Ne being the highest at about 0.4 times solar. We find a possible trend in Trapezium hot plasmas toward low relative abundances of Fe, O, and Ne, which is hard to explain in terms of the dust depletion scenarios of low-mass young stars. Variability was unusually low during our observations relative to other coronally active stars. Qualitatively, the emission is similar to post-main-sequence G-stars. Coronal structures could be compact or comparable to the dimensions of the stellar radii. From comparison to X-ray emission from similar mass stars at various evolutionary epochs, we conclude that the X-rays in θ1 Ori E are generated by a convective dynamo, present during contraction, but which will vanish during the main-sequence epoch possibly to be resurrected during post-main-sequence evolution." @default.
• W3100443284 created "2020-11-23" @default.
• W3100443284 creator A5036914718 @default.
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• W3100443284 creator A5089519043 @default.
• W3100443284 date "2009-11-30" @default.
• W3100443284 modified "2023-10-14" @default.
• W3100443284 title "X-RAY EMISSION AND CORONA OF THE YOUNG INTERMEDIATE-MASS BINARY θ¹Ori E" @default.
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• W3100443284 doi "https://doi.org/10.1088/0004-637x/707/2/942" @default.
• W3100443284 hasPublicationYear "2009" @default.
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