Evolution of photoevaporating disks around massive Young Stellar Objects

Details Evolution of photoevaporating disks around massive Young Stellar Objects Evolution of photoevaporating disks around massive Young Stellar Objects

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40600w&link_type=abstract

Spitzer Proposal ID #40600

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Scientific paper

Our unbiased near-IR survey of UCHII regions uncovered a group of massive Young Stellar Objects (YSOs) with dense, warm circumstellar material. These objects are ubiquitous. They show a bewildering range in properties of their circumstellar material: some display almost featureless and very red continua while others exhibit strong emission lines from both ionized and molecular material. The near-IR spectra of some of these objects show strong evidence for the presence of a remnant accretion disk. A striking result of the survey is that these massive YSOs belong to clusters where also 'naked' O-type stars and near-IR counterparts to UCHIIs exist. We suspect that the differences in the observed circumstellar characteristics are related to the evolutionary status of the young massive star as well as the cluster environment. The proposed Spitzer spectroscopy in combination with a ongoing large observing programme at ESO's VLT (near-infrared Integral Field Spectrscopy), which provides us with a full sensus of the surrounding star-forming region, will allow us to disentangle the influence of the cluster environment on the circumstellar material from the differences in evolutionary status. With SPITZER/IRS we can test this hypothesis by studying the physical nature and composition of the circumstellar material of massive YSOs. The key question is: how do these new-born massive stars clear their environment as it is expected that the physical and chemical processes involved are fundamentally different from those acting in young low-mass stars? We propose to conduct IRS observations of 14 of the most isolated YSOs in our sample and request a total amount of time of 23.0 hours with SPITZER.

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