Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.4502s&link_type=abstract
American Astronomical Society, HEAD Meeting #5, #45.02; Bulletin of the American Astronomical Society, Vol. 32, p.1266
Astronomy and Astrophysics
Astronomy
Scientific paper
Do you wonder what it would be like to study stars in X-rays without blurry images and with good spectra? We have resolved the Orion Trapezium into X-ray point sources with the the High Energy Transmission Grating Spectrometer (HETGS) onboard the Chandra X-ray Observatory. Within 2'x2' around the Orion Trapezium we detected 111 X-ray sources with luminosities between 6x 1028 erg cm-2 s-1 and 2x 1032 erg cm-2 s-1. The two observations separated by 3 weeks reveal a large number of sources which appear variable and heavily absorbed. Some of these also appear in close vicinity to the main Trapezium stars; many are identified with thermal and non-thermal radio sources, as well as with disk-star systems ('proplyds') and we argue that the X-ray emission originates from class I and class II protostars at the cores of the proplyds. X-ray spectra of the brightest, early type members of the Trapezium reveal a variety of thermal spectra with single soft and hard components or a combination of both with temperatures ranging from kT = 0.67 keV to kT = 3.20 keV. High resolution grating spectra resolved the X-ray emission from the stellar wind of θ 1 Ori C into emission lines and a hot continuum. Detailed diagnostics of these emission lines indicate a highly confined, hot and dense plasma as the source of the X-ray emission.
Canizares Calude R.
Huenemoerder Dave
Kastner Joel H.
Lee Julian
Schulz Norbert S.
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