Other
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aspc..267...95k&link_type=abstract
Hot Star Workshop III: The Earliest Stages of Massive Star Birth. ASP Conference Proceedings, Vol. 267. Edited by Paul A. Crowth
Other
12
Scientific paper
With the aim to directly detect the photospheres of newly born, massive stars, we have obtained near-infrared spectra of the deeply embedded, candidate ionizing stars of (ultra-)compact HII regions with the Very Large Telescope. The targets were selected on the basis of their near-infrared luminosity and colour measured from narrow-band images collected in a survey of 45 southern UCHII's. Although the UC HII sample was compiled using the IRAS-colour criterium of Wood &Churchwell, the association with ultracompact (radio) sources, and therefore the secure identification with infant HII regions, is often not obvious. However, the K-band spectroscopy confirms the OB-star nature of 36 strongly reddened stars, among them O stars of very early spectral type. Another twenty stars do not show photospheric absorption lines, but include a strong and broad Brγ emission line. These stars share characteristics with objects classified as massive YSOs (such as, e.g., in M17). We present arguments that they are likely surrounded by a circumstellar disk.
Bik Arjan
Comeron Fernando
Hanson Margaret Murray
Kaper Lex
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