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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 607573.0, MPI für Astronomie / Publikationen_mpia
Dissecting high-mass star-forming regions; tracing back their complex formation history
Authors:Bik, A.; Henning, T.; Stolte, A.; Brandner, W.; Gouliermis, D.; Gennaro, M.; Pasquali, A.; Rochau, B.; Beuther, H.; Wang, Y.
Date of Publication (YYYY-MM-DD):2011-01
Title of Proceedings:Stellar Clusters & Associations: A RIA Workshop on Gaia
Start Page:210
End Page:214
Name of Conference/Meeting:Stellar Clusters & Associations: A RIA Workshop on Gaia
Audience:Not Specified
Abstract / Description:We present near-infrared JHKs imaging as well as K-band multi-object spectroscopy of the massive stellar content of W3 Main using LUCI at the LBT. We confirm 13 OB stars by their absorption line spectra in W3 Main and spectral types between O5V and B4V have been found. Three massive Young Stellar Objects are identified by their emission line spectra and near-infrared excess. From our spectrophotometric analysis of the massive stars and the nature of their surrounding HII regions we derive the evolutionary sequence of W3 Main and we find evidence of an age spread of at least 2-3 Myr. While the most massive star (IRS2) is already evolved, indications for high-mass pre-main-sequence evolution is found for another star (IRS N1), deeply embedded in an ultra compact HII region, in line with the different evolutionary phases observed in the corresponding HII regions. We have detected the photospheres of OB stars from the more evolved diffuse HII region to the much younger UCHII regions, suggesting that the OB stars have finished their formation and cleared away their possible circumstellar disks very fast. Only in the hyper-compact HII region (IRS5) are the early type stars still surrounded by circumstellar material.
Comment of the Author/Creator:Date: 2011 online, n/a 1, 2011
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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