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arXiv 0712.3958astro-ph
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M31星系星团的测光。孔径尺寸效应

Photometry of Star Clusters in the M31 Galaxy. Aperture Size Effects

D. Narbutis, V. Vansevicius, K. Kodaira, A. Bridzius, R. Stonkute

摘要:

本文研究了在拥挤视场中星团测光的孔径效应。对M31星系盘西南区域的285个候选星团样本进行了测试,这些样本是在本星系群巡天镶嵌图像中测量的(Massey等人,2006年)。在大多数情况下,推导的UBVRI测光误差代表团簇颜色的准确性很好,然而,对于微弱的对象,居住在拥挤的环境中,颜色的不确定性可能被低估。因此,在通过将测量的颜色与SSP模型进行比较来获得聚类参数之前,必须考虑由于背景拥挤而产生的颜色偏差。将我们的测光数据与Krienke和Hodge(2007)的哈勃太空望远镜观测数据进行了比较。

英文摘要:

A study of aperture size effects on star cluster photometry in crowded fields is presented. Tests were performed on a sample of 285 star cluster candidates in the South-West field of the M31 galaxy disk, measured in the Local Group Galaxy Survey mosaic images (Massey et al. 2006). In the majority of cases the derived UBVRI photometry errors represent the accuracy of cluster colors well, however, for faint objects, residing in crowded environments, uncertainties of colors could be underestimated. Therefore, prior to deriving cluster parameters via a comparison of measured colors with SSP models, biases of colors, arising due to background crowding, must be taken into account. A comparison of our photometry data with Hubble Space Telescope observations of the clusters by Krienke and Hodge (2007) is provided.

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