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首页> 外文期刊>The Astrophysical journal >DETECTION OF STELLAR VARIABILITY IN THE CENTRAL PARSEC OF THE GALAXY
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DETECTION OF STELLAR VARIABILITY IN THE CENTRAL PARSEC OF THE GALAXY

机译:检测银河系中央区的星状变化

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摘要

We have searched for time variability of the stars in the central parsec of the Galaxy through K-band (2.2 μm) imaging and photometry. The observations were made with an array-based camera at the NASA Infrared Telescope Facility in 1991, 1992, and 1993. In 1991, on timescales ranging from 20 s to a week, no time variability greater than 0.1 mag was found for about five dozen sources in this region, and the brighter sources were stable to ~0.05 mag. On timescales of 1-2 yr, we found a new source near IRS 10E that varied in brightness by at least 1 mag and detected variability of 0.15 to 0.5 mag in several other sources, most notably the red giants IRS 9 and IRS 12N. None of the luminous blue stars identified in the Galactic center region shows evidence for variability.
机译:我们已经通过K波段(2.2μm)成像和光度法搜索了银河系中央视差中恒星的时变性。这些观测是在1991、1992和1993年在美国宇航局红外望远镜设施中使用基于阵列的相机进行的。1991年,在从20 s到一周的时间范围内,未发现约有五十二个时间变化大于0.1 mag在该区域,较亮的源稳定在〜0.05 mag。在1-2年的时间尺度上,我们在IRS 10E附近发现了一个新的光源,其亮度变化至少1 mag,并在其他几个光源中检测到0.15到0.5 mag的变化,最著名的是红色巨人IRS 9和IRS 12N。在银河系中心区域识别出的所有发光蓝星均未显示出变异性的证据。

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