X-Ray Flares from a Late B-Type Star, HD 38563S, in NGC 2068 Observed with Chandra X-Ray Observatory
X-Ray Flares from a Late B-Type Star, HD 38563S, in NGC 2068 Observed with Chandra X-Ray Observatory
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钱德拉 X 射线天文台观测到的 NGC 2068 中一颗晚期 B 型恒星 HD 38563S 的 X 射线耀斑
DOI：
10.1093/pasj/56.5.813
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
K. Makishima
中科院分区：
文献类型：
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作者：
T. Yanagida;Y. Ezoe;K. Makishima
本文报道了NGC2068的Chandra档案数据分析，它是最近的(∼400pc)和X射线活动恒星形成区之一，估计年龄为105-6年。观察时间为100k。使用波探测工具，探测到152个X射线源，其中52个在2MASS调查中有对应的X射线源。最亮的X射线源之一显然是一颗V=10.42的B型主序星HD 38563S。在观测期间，它出现了两次X射线耀斑，0.5keV-8.0keV光度达到∼1031.6 ergs−1。耀斑X射线在几个小时的时间尺度上演化，并显示出∼5keV的温度热谱。这些结果表明，这颗恒星形成了一颗活跃的双星，尽管被T金牛座恒星污染也是一种替代可能性。
A report is made on the Chandra archival data analysis of NGC 2068, which is one of the nearest (∼ 400pc) and X-ray active star-forming regions, with an estimated age of 105–6 yr. The observation was made for 100 ks. Using the wavdetect tool, 152 X-ray sources were detected, of which 52 had counterparts in the 2MASS survey. One of the brightest X-ray sources is apparently identified with a V = 10.42 late B-type main-sequence star, HD 38563S. During the observation, it exhibited two X-ray flares, with the 0.5–8.0 keV luminosity reaching∼ 1031.6 ergs−1. The flare X-rays evolved on a time scale of several hours, and showed a thermal spectrum of temperature of ∼ 5keV. These results suggests that this star forms an active binary, although contamination by a T Tauri star also remains an alternative possibility.