ROSAT HRI observations of hot stars in the Orion Nebula

Details ROSAT HRI observations of hot stars in the Orion Nebula ROSAT HRI observations of hot stars in the Orion Nebula

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...432..386c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 432, no. 1, p. 386-391

Astronomy and Astrophysics

Astronomy

35

Binary Stars, Emission Spectra, Hot Stars, Interstellar Matter, Line Spectra, Orion Nebula, X Ray Astronomy, X Ray Spectra, X Ray Stars, Astronomical Interferometry, H Alpha Line, Rosat Mission, Stellar Luminosity

Scientific paper

ROSAT High Resolution Interferometer (HRI) observations of hot (O6-A5) stars in the Orion Nebula region are presented. Fourteen of 21 O6-B5 stars were detected and all of them appear to have X-ray luminosities and Lx/Lbol ratios similar to field O6-B5 stars. The brightest star in the Trapezium, the O7 V star theta1 C Ori, has notable variation in its X-ray emission; the variation seems to have the same phase dependence as recently found for the star's hydrogen alpha emission. A maximum of six of 27 B6-A5 stars observed were detected; we argue that the most likely explanation for their X-ray emission is that it arises from unseen, low-mass binary companions.

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