X-Ray Flares from an Hα Emission-Line Star in the Orion Region, Kiso A0904-105

Details X-Ray Flares from an Hα Emission-Line Star in the Orion Region, Kiso A0904-105 X-Ray Flares from an Hα Emission-Line Star in the Orion Region, Kiso A0904-105

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pasj...52..161y&link_type=abstract

Publications of the Astronomical Society of Japan, v.52, p.161.

Astronomy and Astrophysics

Astronomy

2

Stars: Flare, Stars: Pre, Main-Sequence, X-Rays: Sources, X-Rays: Spectra, X-Rays: Stars

Scientific paper

We analyzed ASCA data, including the reflection nebula NGC 2023, and discovered two X-ray flares from an Hα emission-line star, Kiso A0904-105, located at ~ 30' to the southwest of NGC 2023. The separation time between the two flares was ~ 4 hr. The temperatures of the first and second flares reached (5-7)*E7 K and the luminosities around the flare peaks were ~ 1033 erg s-1 (0.5-10.0 keV energy band, assuming the distance of 400 pc), which are comparable to those of the giant X-ray flares from T Tauri stars. After the flare peaks, X-ray intensity exhibited an exponential decay. Comparing the flares with those from T Tauri stars, we found that the physical parameters in the flaring plasma were within the range of those obtained from T Tauri stars.

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