An infrared view of (candidate accretion) disks around massive young stars
| Autor: | Bik, A., Lenorzer, A., Thi, W.F., Puga Antolín, E., Waters, L.B.F.M., Kaper, L., Martín-Hernández, N.L., Beuther, H., Linz, H., Henning, T. |
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| Přispěvatelé: | High Energy Astrophys. & Astropart. Phys (API, FNWI), Low Energy Astrophysics (API, FNWI) |
| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Massive Star Formation: Observations Confront Theory: proceedings of a conference held at the Heidelberg Convention Center, Heidelberg, Germany, 10-14 September 2007, 78-85 STARTPAGE=78;ENDPAGE=85;TITLE=Massive Star Formation: Observations Confront Theory |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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