The Pre-Main-Sequence Stars and Initial Mass Function of NGC 2264
The Pre-Main-Sequence Stars and Initial Mass Function of NGC 2264
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NGC 2264 的前主序恒星和初始质量函数
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
Y. Kang
中科院分区：
文献类型：
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作者：
Byeong;H. Sung;M. Bessell;Y. Kang
在NGC 2264的南部区域进行了UBVRI和Hα CCD测光。一个几乎完整的主序前（PMS）成员的列表已经从本研究中识别的Hα发射星的汇编加上那些在以前的调查中选择的，连同X射线发射的恒星。使用H-R图，我们测试了一组四个PMS演化模型的基础上的PMS年龄和年龄分布估计的集群和个别恒星之间的质量年龄关系。由此得到的初始质量函数（IMF）与太阳邻域的场星星IMF非常一致，在质量范围为0.3 ≤ log m ≤ 0.8时，IMF斜率为Γ = -1.7。
UBVRI and Hα CCD photometry has been performed in the southern region of NGC 2264 around the Cone Nebula. A nearly complete list of pre–main-sequence (PMS) members in the cluster has been made from the compilation of Hα emission stars identified in this study plus those selected in previous investigations, together with stars with X-ray emission. Using the H-R diagram, we tested a set of four PMS evolution models based on the PMS age and age spread estimate for the cluster and the mass-age relationship among individual stars. The resultant initial mass function (IMF) is in good agreement with the field star IMF of the solar neighborhood, with an IMF slope Γ = -1.7 in the mass range 0.3 ≤ log m ≤ 0.8.