Hidden new-born massive stars in compact H II ``blobs'' of the Large Magellanic Cloud

Details Hidden new-born massive stars in compact H II ``blobs'' of the Large Magellanic Cloud Hidden new-born massive stars in compact H II ``blobs'' of the Large Magellanic Cloud

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8247h&link_type=abstract

HST Proposal ID #8247

Computer Science

Hst Proposal Id #8247 Stellar Populations In Clusters

Scientific paper

High spatial resolution imaging with WFPC2 is necessary to resolve very tight clusters of massive stars at birth in the Large Magellanic Cloud. These are the youngest massive stars accessible to direct observations at ultraviolet and optical wavelengths. Situated in an extremely rare category of H II regions in the Magellanic Clouds {only 5'' to 10'' across and of very high excitation}, these stars should rank among the hottest ones in these galaxies. Using medium-band continuum filters, we will place the resolved components on color- magnitude diagrams to identify the exciting and youngest stars for follow up STIS spectroscopy. Imaging in HBeta, [O III] , and HAlpha will allow us to correct for the extinction and for the nebular emission. Following our recent HST result on the SMC ``blobs'' N81 {STScI Press Release 98-25, July 1998} and N88A, we are confident that the planned observations will uncover the stellar contents of the LMC objects N160A1, N83B-1, and N11A. These objects provide exceptional opportunities for studying various key phenomena related to massive star formation, in particular whether these massive stars form in isolation or inside co-spatial tight clusters. The observations will also enable us to study the ``blob'' phenomenon at different evolutionary stages in the chemically distinct evironments of the SMC and the LMC.

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