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Paper: The Stellar Population of Ultracompact HII Regions: the Case of IRAS 10049-5657
Volume: 267, Hot Star Workshop III: the Earliest Stages of Massive Star Birth
Page: 343
Authors: Bik, A.; Kaper, L.; Hanson, M. M.; ComerĂ³n, F.
Abstract: We have performed a near-infrared survey of 45 ``southern'' UCHII's and identified the deeply embedded, ionizing stars using VLT/ISAAC K-band spectroscopy. The (photospheric) spectra of these young massive stars allow the secure classification of their photospheric properties. As an example, we discuss the UCHII IRAS 10049-5657, which hosts a young cluster of stars. Two of the cluster members are classified as O4/O5 and O6, respectively. With this classification, the cluster ZAMS and distance is calibrated. The cluster consists of several dozen OB stars and likely is a recently formed OB association.
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