Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46..473y&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 5, p. 473-478
Astronomy and Astrophysics
Astronomy
5
Abundance, Astronomical Models, Molecular Clouds, O Stars, Orion Constellation, Pre-Main Sequence Stars, Star Formation, Thermal Emission, X Ray Astronomy, X Ray Stars, Ginga Satellite, Heao 2, Plasma Temperature, Thermal Plasmas, X Ray Detectors, X Ray Spectroscopy
Scientific paper
The Orion B cloud was observed with the Large Area Counter (LAC) onboard the X-ray satellite Ginga. Although the field of view of LAC included O-type stars, zeta Ori (O9.5 Ib) and sigma Ori (O9.5 V), as well as the Orion B cloud, the contributions of zeta Ori and sigma Ori were estimated to be less than approximately 34% of the observed count rate by both extrapolating the result of the Einstein Observatory of zeta Ori and assuming that both zeta Ori and sigma Ori have the same spectrum as that of delta Ori with a similar spectral type of O9.5 II. The X-ray spectrum after subtracting the contributions was well represented by a thin thermal plasma model with a temperature of 4.7 +/- 0.6 keV. The best-fit abundance of iron was 0.25 +/- 0.13 cosmic. Since many pre-main-sequence stars have been discovered in the Orion B cloud region, the origin of the thermal emission is considered to be the integrated emission from X-ray emitting pre-main-sequence stars embedded in the Orion B cloud. It follows from the results obtained in wide energy band observations that thermal emission with a temperature of several keV is a common characteristic of active star-forming regions.
Inda-Koide Mika
Koyama Katsuji
Yamauchi Shigeo
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