Young massive stars in ultra-compact HIIregions

Details Young massive stars in ultra-compact HIIregions Young massive stars in ultra-compact HIIregions

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jad.....8....8k&link_type=abstract

The Journal of Astronomical Data, Vol. 8, 8F 2002

Astronomy and Astrophysics

Astronomy

Scientific paper

Using ISAAC mounted at ESO's Very Large Telescope, we have obtained medium-resolution K-band spectra of newly formed massive stars, which are deeply embedded in ultra-compact Hii regions (UCHIIs). Candidate young massive stars were selected on the basis of their near-infrared luminosity and colour measured from narrow-band images obtained in a survey of 45 southern UCHIIs. This strategy turned out to be very successful: follow-up spectroscopy confirmed the OB-star nature of 36 embedded stars, among them O stars of very early spectral type. The K-band spectra of over a dozen stars do not show photospheric absorption lines, but include a strong and broad Brgamma emission line. These stars might represent an early phase in the evolution of massive stars, when they are still surrounded by a circumstellar disk. Our ultimate goal is to better understand the formation process of the most massive stars.

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