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S. E. Dahm, T. Simon (U. of Hawaii), E. David (Xavier U.)
We present initial results from an H-alpha and X-ray emission survey of the young cluster NGC 2264 in the Mon OB1 association. Approximately 450 emission H-alpha stars were identified in a 25'X40' field roughly centered between the O7V multiple star S Mon and the Cone Nebula. The H-alpha emission survey was carried out using the wide-field grism spectrograph on the University of Hawaii 2.2 meter telescope and the Gemini Multi-Object Spectrograph (GMOS). The XMM-EPIC observations of the cluster are discussed in detail in the accompanying poster by David et al. (2004). Additionally, we obtained optical (BVRCIC) and near infrared (JHK) photometry for selected fields in NGC 2264 to supplement published data from previous investigations and to ensure coverage for the majority of detected emission H-alpha stars and X-ray sources. Optical color-magnitude diagrams are presented and used to derive ages and masses from theoretical isochrones and evolutionary tracks for the candidate pre-main sequence stars. We analyze the X-ray luminosity functions of classical and weak-line T Tauri stars in NGC 2264 and seek correlations among LH-alpha, LX, spectral type and theoretical age. Finally, the distribution and density of emission H-alpha stars in the cluster are discussed and compared with those found in other star forming regions including IC 348, IC 5146 and NGC 2362. This research was supported in part by the NASA XMM-Newton Guest Observer program and the NASA Graduate Student Research Program.
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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.