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1999A&A...344..848H - Astronomy and Astrophysics, volume 344, 848-856 (1999/4-3)

Very young massive stars in the Small Magellanic Cloud, revealed by HST.

HEYDARI-MALAYERI M., ROSA M.R., ZINNECKER H., DEHARVENG L. and CHARMANDARIS V.

Abstract (from CDS):

High spatial resolution imaging with the Hubble Space Telescope allowed us to resolve the compact HII region N 81 lying in the Small Magellanic Cloud (SMC). We show the presence of a tight cluster of newborn massive stars embedded in this nebular blob'' of ∼10" across. This is the first time the stellar content and internal morphology of such an object is uncovered. These are among the youngest massive stars in this galaxy accessible to direct observations at ultraviolet and optical wavelengths. Six of them are grouped in the core region of ∼2" diameter, with a pair of the main exciting stars in the very center separated by only 0.27" or 0.08pc. The images display violent phenomena such as stellar winds, shocks, ionization fronts, typical of turbulent starburst regions. Since the SMC is the most metal-poor galaxy observable with very high angular resolution, these observations provide important templates for studying star formation in the very distant metal-poor galaxies which populate the early Universe.

Journal keyword(s): stars: early-type - stars: Wolf-Rayet - ISM: dust, extinction - ISM: HII regions - ISM: individual objects: N 81 (SMC) - galaxies: Magellanic Clouds

Nomenclature: Table 1: [HRZ99] NN N=19 among 37.

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2023.02.05-02:38:24

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