Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sf2a.conf..529h&link_type=abstract
SF2A-2002: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 24-29, 2002, Eds.: F. Combes and D. Barret,
Astronomy and Astrophysics
Astrophysics
Scientific paper
Recent high resolution imaging and spectroscopy using the Hubble Space Telescope (HST) have brought new insight into the physical properties of high excitation "blobs" (HEBs), a rare class of compact HII regions in the Magellanic Clouds. Contrary to the typical HII regions of these subsolar metallicity galaxies, which are extended struc-tures with sizes greater than 50pc, the compact HII regions are an order of magnitude smaller having diameters of less than about 3pc. HEBs are believed to be the final stages in the evolution of the ultra-compact HII regions whose Galactic counter-parts are detected only at infrared and radio wavelengths. These observations show that in spite of their small size HEBs are in general excitedby more than one newborn massive star, most likely of an O6-O8 type. Surprisingly though, far UV spectroscopy also shows an astonishing weakness of their wind profiles and their sub-luminosity, up to 2 mag fainter in MV than the corresponding dwarfs. Our analysis suggests that these stars are probably in the Hertzsprung-Russell diagram locus of a particularly young class of massive stars, the so-called Vz luminosity class, as they are arriving on the zero age main sequence.
Charmandaris Vassilios
Deharveng Lise
Heydari-Malayeri Mohammad
Meynadier Frederic
Rosa Michael R.
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