Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999head....4.0903g&link_type=abstract
American Astronomical Society, HEAD meeting #4, #09.03; Bulletin of the American Astronomical Society, Vol. 31, p.705
Astronomy and Astrophysics
Astronomy
Scientific paper
The discovery of 15-day periodic H-alpha and He II emission on the central star of the Orion Nebula, theta 1 Orionis C (O7 V), suggests that this O star is an oblique magnetic rotator. The subsequent detection of large-amplitude, periodic X-ray variations led Babel and Montmerle to propose that the O star's magnetically confined wind is shocked near the magnetic equator, producing an X-ray cooling disk. In this poster, we present ASCA SIS spectra of the Trapezium obtained at rotational phases 0.01, 0.45, and 0.77. Because many unresolved T Tauri stars and OB stars produce about half the ASCA SIS flux, ROSAT HRI images obtained at similar phases and an ASCA raytrace code have been used to help reconstruct the SIS spectra. By all indications, theta 1 Ori C is a very hot source (kT > 3.0 keV). Suprisingly, we see little or no evidence of variable wind attenuation.
Caillault Jean-Pierre
Gagne Marc
Linsky Jeffrey L.
Song Inseok
Stauffer Joh R.
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