由宽谱带photometry推算星系团质量和年龄的有效范围
The range of validity of cluster masses and ages derived from broad-band photometry
摘要：
我分析的随机效应引入的恒星初始质量函数（SIMF）的采样在推导的个人质量和集群质量函数（CMF）从宽带可见光-近红外未分辨测光。用未加权UBV测光同时确定星团年龄和光度的经典方法，对于年龄大于约100年的星团是不可靠的。30 Ma，即使是相对较大的星团质量。另一方面，增加滤波器组以包括更长波长的滤波器并为每个滤波器使用权重，增加了可以用未分辨光度法精确测量的质量和年龄的范围。尽管如此，一个相对较大的范围内的质量和年龄被认为是占主导地位的SIMF采样效果，使所观察到的质量无用，即使使用UBVRIJHK测光。
英文摘要：
I analyze the stochastic effects introduced by the sampling of the stellar initial mass function (SIMF) in the derivation of the individual masses and the cluster mass function (CMF) from broad-band visible-NIR unresolved photometry. The classical method of using unweighted UBV photometry to simultaneously establish ages and extinctions of stellar clusters is found to be unreliable for clusters older than approx. 30 Ma, even for relatively large cluster masses. On the other hand, augmenting the filter set to include longer-wavelength filters and using weights for each filter increases the range of masses and ages that can be accurately measured with unresolved photometry. Nevertheless, a relatively large range of masses and ages is found to be dominated by SIMF sampling effects that render the observed masses useless, even when using UBVRIJHK photometry.
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