High-resolution imaging of ultracompact H II regions regions. II. G5.89-0.39 revisited

Details High-resolution imaging of ultracompact H II regions regions. II. G5.89-0.39 revisited High-resolution imaging of ultracompact H II regions regions. II. G5.89-0.39 revisited

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...346..243f&link_type=abstract

Astronomy and Astrophysics, v.346, p.243-259 (1999)

Astronomy and Astrophysics

Astrophysics

25

Stars: Formation, Stars: Early-Type, Ism: H Ii Regions, Methods: Observational

Scientific paper

We present the results of an extensive imaging campaign on the ultracompact Hii region G5.89-0.39 at near- and mid-infrared wavelengths. High-resolution data were taken in the H, K', and L bands using ESO's adaptive optics system ADONIS. They are complemented by conventional narrow-band images in Br gamma and H_2(1-0)}S1 as well as by mid-infrared broad- and narrow-band images. We also mapped the 1.3 mm continuum emission from the source using the SEST. We use our data to consistently explain the morphological appearance of G5.89-0.39 at all observed wavelengths as well as its spectral energy distribution. The complete model of the source consists of a spherical shell of dust with an inner, dust-free cavity of 7.6x 10(16) cm radius surrounding a star of spectral type O6 ZAMS. Two outflows escape this shell in opposite directions. Half of the whole configuration is evidently obscured by a very massive cloud of cold dust. Comparisons with earlier models and other ultracompact Hii regions are drawn to put G5.89-0.39 in the context of massive star formation. Based on observations collected at the European Southern Observatory, La Silla, Chile

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