Spectral Energy Distributions, Ages, and Metallicities of Star Clusters in M33
Spectral Energy Distributions, Ages, and Metallicities of Star Clusters in M33
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DOI：
10.1086/323098
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发表时间：
2001-10
期刊：
影响因子：
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通讯作者：
Jun Ma;Xu Zhou;X. Kong;Hong Wu;Jian-sheng Chen;Zhao-ji Jiang;Jin Zhu;S. Xue
中科院分区：
文献类型：
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作者：
Jun Ma;Xu Zhou;X. Kong;Hong Wu;Jian-sheng Chen;Zhao-ji Jiang;Jin Zhu;S. Xue
本文介绍了M33螺旋星系中由M33、比安奇和福特等人探测到的星星团的CCD分光光度法。这些图像是用北京天文台60/90 cm施密特望远镜在3800到10000 nm的13个中带滤波器中获得的。从1995年9月23日到2000年8月28日，观测覆盖了M33的整个区域，总积分为32.75小时。这提供了一个M33的位图，像素为1.“7 × 1.”7。通过孔径测光，我们得到了这些星星团的光谱能量分布。利用星族合成的理论模型，我们还得到了这些星星团的年龄和金属丰度的分布。这些星系团形成于103 × 106-1010年之间，其金属丰度跨度很大，Z = 0.0004 - 0.05。
In this paper, we present CCD spectrophotometry of the star clusters that were detected by Chandar, Bianchi, & Ford in the nearby spiral galaxy M33. The images were obtained with the Beijing Astronomical Observatory 60/90 cm Schmidt Telescope in 13 intermediate-band filters from 3800 to 10000 Å. The observations cover the whole area of M33 with a total integration of 32.75 hr from 1995 September 23 to 2000 August 28. This provides a multicolor map of M33 in pixels of 1.″7 × 1.″7. By aperture photometry, we obtain the spectral energy distributions of these star clusters. Using theoretical stellar population synthesis models, we also obtain the distributions of age and metallicity of these star clusters. These clusters formed continuously from ∼3 × 106–1010 yr and have a large span of metallicity from Z = 0.0004 to 0.05.