An infrared view of (candidate accretion) disks around massive young stars

Details An infrared view of (candidate accretion) disks around massive young stars An infrared view of (candidate accretion) disks around massive young stars

2007-12-03

arxiv.org/abs/0712.0301v1

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures, to appear in the proceedings for "Massive Star Formation: Observations confront Theory 2007" edited by H.

Scientific paper

Near-infrared surveys of high-mass star-forming regions start to shed light onto their stellar content. A particular class of objects found in these regions, the so-called massive Young Stellar Objects (YSOs) are surrounded by dense circumstellar material. Several near- and mid-infrared diagnostic tools are used to infer the physical characteristics and geometry of this circumstellar matter. Near-infrared hydrogen emission lines provide evidence for a disk-wind. The profiles of the first overtone of the CO band-heads, originating in the inner 10 AU from the central star, are well fitted assuming a keplerian rotating disk. The mid-infrared spectral energy distribution requires the presence of a more extended envelope containing dust at a temperature of about 200 K. CRIRES observations of CO fundamental absorption lines confirm the presence of a cold envelope. We discuss the evolutionary status of these objects.

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