Tight clusters of newly born massive stars in compact h2 regions of the Magellanic Clouds

Details Tight clusters of newly born massive stars in compact h2 regions of the Magellanic Clouds Tight clusters of newly born massive stars in compact h2 regions of the Magellanic Clouds

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6535h&link_type=abstract

HST Proposal ID #6535

Computer Science

Hst Proposal Id #6535 Hot Stars

Scientific paper

We propose high spatial resolution imaging with the HST Planetary Camera 2 in order to resolve very tight clusters of massive stars at birth in the Magellanic Clouds. These are the youngest massive stars accessible to direct observations at ultraviolet and optical wavelengths. Situated in an extremely rare category of h2 regions in the Magellanic Clouds {diameters ranging from 4'' to 10'' only}, these stars should rank among the hottest ones in these galaxies, as inferred from the exceptionally high nebular O III{4959Angstrom+5007Angstrom}/HBeta ratios. Using medium-band continuum filters, we will place the resolved components on H- R diagrams to obtain their masses and evolutionary states. Imaging in the He II 4686 Angstrom line will identify the hottest components of the tight clusters, and will provide estimates for the effective temperatures. Imaging in HBeta, O III, and HAlpha will allow us to correct for the extinction and for the nebular emission.

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