Spectral Energy Distributions and Age Estimates of 78 Star Clusters in M33
Spectral Energy Distributions and Age Estimates of 78 Star Clusters in M33
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DOI：
10.1086/340361
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发表时间：
2002-02
期刊：
影响因子：
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通讯作者：
Jun Ma;Xu Zhou;Jian-sheng Chen;Hong Wu;Zhao-ji Jiang;S. Xue;Jin Zhu
中科院分区：
文献类型：
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作者：
Jun Ma;Xu Zhou;Jian-sheng Chen;Hong Wu;Zhao-ji Jiang;S. Xue;Jin Zhu
在我们系列的第三篇论文中，我们介绍了 Chandar、Bianchi 和 Ford 在附近的螺旋星系 M33 中检测到的 78 个星团的 CCD 分光光度法。 M33 的 CCD 图像是 BATC 多色天空巡天的一部分，通过 13 个 3800 至 10000 Å 的中带滤光片获得。通过孔径光度测量，我们获得了这78个星团的光谱能量分布。正如 Chandar、Bianchi 和 Ford 所做的那样，我们通过将每个天体的光度测定与不同金属丰度值的理论恒星种群合成模型进行比较来估计样本团的年龄。我们发现样本簇在M33中从~3×106年到1010年连续形成。这个结论与 Chandar、Bianchi 和 Ford 一致。结果还表明，这些星团在~8×106和~109年有两个星团形成峰值。
In this third paper of our series, we present CCD spectrophotometry of 78 star clusters that were detected by Chandar, Bianchi, & Ford in the nearby spiral galaxy M33. CCD images of M33 were obtained as a part of the BATC Multicolor Sky Survey of the sky in 13 intermediate-band filters from 3800 to 10000 Å. By aperture photometry, we obtain the spectral energy distributions of these 78 star clusters. As Chandar, Bianchi, & Ford did, we estimate the ages of our sample clusters by comparing the photometry of each object with theoretical stellar population synthesis models for different values of metallicity. We find that the sample clusters formed continuously in M33 from ∼3 × 106 to 1010 yr. This conclusion is consistent with Chandar, Bianchi, & Ford. The results also show that there are two peaks in cluster formation at ∼8 × 106 and ∼109 yr in these clusters.