The Search for ``True'' Starburst Dust and the Importance of Metallicity on Properties of O & B Stars

Details The Search for ``True'' Starburst Dust and the Importance of Metallicity on Properties of O & B Stars The Search for ``True'' Starburst Dust and the Importance of Metallicity on Properties of O & B Stars

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8629b&link_type=abstract

HST Proposal ID #8629

Physics

Hst Proposal Id #8629 Stellar Populations

Scientific paper

Much of what we know about starburst {SB} galaxies, at low and high redshift, depends upon the nature of the SB dust extinction and the intrinsic physical parameters of OB stars versus metallicity. Typically SBs, unlike our Galaxy, exhibit extinction laws with no 2200Angstrom peak. There is little information on the effects of dense star-formation on dust extinction properties. Specifically, no UV-visual extinction studies exist for the dense star-forming regions of 30 Dor {LMC} and NGC 346 {SMC}, which represent prime laboratories for studying these effects. These regions have the highest concentration of young O stars in these galaxies, where 30 Dor is the nearest example of a definite starburst. Using the 2-D capability of STIS, we will a.} perform the first UV-visual extinction study of the dense regions of 30 Dor {in and around R136} and NGC 346, b.} produce unreddened OB star flux distributions in 30 Dor and NGC 346, c.} use these results to derive effective temperature, luminosity, and mass-loss rate correlations with spectral type and metallicity, and d.} explore if the extinction for the cores of 30 Dor and NGC 346 can be used to generate ``true'' starburst extinction laws.

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